try doing sth. 表示“试着做某事”。
④ stop to do sth. 表示“停下来接着做另一件事”；
stop doing sth. 表示“停止做某事”。
⑤ go on to do sth. 表示“（做完某事）接着做另一件事”；
go on doing sth. 表示“继续做同一件事”（= go on with sth.）。
⑥ can’t help to do sth. 表示“不能帮助做某事”；
can’t help doing sth. 表示“情不自禁地做某事”。
3. have/has been doing
have / has been doing是现在完成进行时的构成，强调动作的延续过程，动作可能还在进行。而have / has done是现在完成时的构成，强调动作的结果，该动作通常已经结束。
[例句]
①I have written a book. （动作结束）
②I have been writing a book. （可能未写完，侧重最近一直忙于写书）
【模拟试题】
一、单项填空
1. The headmaster called Tom to his office because he had been in the exam .
A. caught cheating B. caught to cheat
C. catching cheating D. catching to cheat
2. The time he for the trip is not suitable any of us .
A. made ; to B. fixed ; for C. gave ; with D. fixed ; to
3. -What do you think of what he did in class ?
-Why he did it was my imagination .
A. beyond B. through C. above D. over
4. My watch is nowhere to be found . I it when I was on the bus .
A. must drop B. can’t have dropped
C. have dropped D. must have dropped
5. -May I speak to your manager Mr. Williams at five o’clock tonight?
-I’m sorry . Mr. Williams to a party long before then .
A. will have gone B. had gone
C. should have gone D. has gone
26. Forty percent of the population of the U.S black.
A. is B. are C. am D. have
7. the party , we would never have today’s happiness .
A. But for B. Only if C. If only D. If
8. Don’t leave matches or cigarettes on the table within of little children.
A. hand B. reach C. space D. distance
9. He accidentally he had quarreled with his wife and that he hadn’t been home for a couple of weeks .
A. let out B. took care C. made sure D. made out
10. -Go for a picnic this weekend , OK ?
- , I love getting close to nature .
A. I couldn’t agree more B. I’m afraid not
C. I believe not D. I don’t think so
11. On news today , there were reports of heavy snow in that area .
A. the ; the B. the；不填C. 不填；不填D. 不填；the
12. It was a pity that the great writer died his works unfinished .
A. for B. with C. from D. of
13. The final examination is coming up soon . It’s time for us to our studies .
A. get down to B. get out C. get back for D. get over
14. Having been attacked by terrorists , .
A. doctors came to their rescuer B. the tall building collapsed
C. an emergency measures was taken D. warnings were given to tourists
15. The flowers sweet in the garden attract the visitors to the beauty of nature.
A. to smell B. smelling C. smelt D. smell
二、完型填空
No man can change the weather. Nobody can control the weather. But if we 1 correctly the signs around us we can 2 what the more changes in the weather will be . This way of telling what the weather will be like the following day or two is called weather forecasting.
For many centuries and in all countries people have 3 the weather and tried to 4 weather forecasting.
Sometimes 5 objects such as hills and tall trees seem to be very clear and near. This is a 6 of much water vapor in the 7 and therefore rain will probably come.
Rings round the sun are a sign of coming rain. Many people feel in their 8 the coming of wet weather. Their joints （骨头节） ache . Some birds fly 9 as fine weather is coming but they fly near the ground if 10 or stormy weather is 11 the way. It is probably because of the insects which they are hunting 12 they fly 12 .
If you see a rainbow during rainy weather , this is a sign that the weather will become clear and fine . Such 14 always come in the evening . If the stars 15 clearly at night , then fair weather will 16 . If a fog appears in the morning just about sunrise , then the day will be warm . Instead , if a fog appears in the evening the next day will bring wet 17 .
If the sunset is mostly red in 18 then the following day will be fine . If a rainbow appears in the morning, rainy weather will probably come .
Most of the 19 sayings have been made by people who have used their 20 , and brains to make weather forecasting .
1. A. see B. look C. read D. take
2. A. tellB. speakC. talk D. point
3. A. studied B. learned C. searched D. researched
4. A. do B. make C. carry D. send
5. A. small B. away C. near D. distant
6. A. sight B. sign C. mark D. shape
7. A. air B. sky C. heaven D. earth
8. A. legs B. armsC. skins D. bones
9. A. high B. low C. near D. far
10. A. wet B. dry C. rainy D. sunny
11. A. by B. in C. for D. on
12. A. that B. which C. where D. when
13. A. high B. low C. fast D. slow
14. A. as B. rainbows C. weather D. day
15. A. twinkle B. appear C. bright D. seem
16. A. beginB. stop C. continue D. be
17. A. day B. weather C. hour D. time
18. A. edge B. surface C. center D. color
19. A. above B. below C. important D. interesting
20. A. bodies B. hands C. eyes D. legs
三、阅读理解
（A）
There are three branches of medicine . One is called “doctor medicine” , or “scientific medicine”。 Scientific doctors try to observe sicknesses , look for logical patterns , and then find out how the human body works . From there they figure out what treatments may work . This kind of medicine is believed to date from the 4th century BC. Although nowadays it is successful , in the ancient world this approach probably did not cure many patients .
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