— Tom is never late for work. Why is he absent today ?— Something _______ to him
题型：不详难度：来源：
— Tom is never late for work. Why is he absent today ?
— Something _______ to him. | A．must happen | B．should have happened | | C．could have happened | D．must have happened |
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答案
| D |
解析
| must have done表示对过去事情的肯定推断，意为：过去一定做了某事。A表示对现在或示来事情的肯定推敲；B意为：本应该发生；C意为：可能已经发生，口气不太肯定，由于前一句意为：汤姆上班从未迟到过，而判断他今天缺席一定是因为出了什么事了。 |
举一反三
The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow. | A．should | B．must | C．will | D．can |
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| Helen ______ go on the trip with us, but she isn’t quite sure yet. |
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
— Oh, dear ! She ______ a lot of difficulties !| A．may go through | B．might go through | | C．ought to have gone through | D．must have gone through |
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He paid for a seat, when he ______ have entered free. | A．could | B．would | C．must | D．need |
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This cake is very sweet. You _____ a lot of sugar in it. | A．should put | B．could have put | C．might put | D．must have put |
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