The light is still on. They ___ to turn it off when they left the room.A．must fo
题型：不详难度：来源：
The light is still on. They ___ to turn it off when they left the room.| A．must forget | B．could have forgotten | | C．may forget | D．must have forgotten |
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答案
| D |
解析
| 考查虚拟语气。结合上文，灯仍然亮着，可知是对过去的事情的推测。“must+have+done”表示对过去事情的肯定推测；“could+have+done”表示对过去事情的假设。结合题意可知下文是推测语气，故选D。 |
举一反三
Often, when he something that him, he wasted his time dozing.| A．should be doing, gave | | B．should have been doing, was given | | C．should do, was given | | D．should have been doing, had given |
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Perhaps you ________ stop playing computer games now. Your boss may be turning up in the office at any moment.| A．will | B．must | C．should | D．can |
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What a pity! When we got to the cinema, the movie Let the Bullets Fly _________, so we saw only the end of it. | A．was finishing | B．would be finishing | C．just finished | D．had just finished |
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| ____ anyone phone during the board meeting, please tell them I am busy. |
The weather turned out to be fine yesterday. I the trouble to carry my umbrella with me.
A should have taken B could have taken C needn’t have taken D mustn’t have taken |
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