He is an hour late by now．He last night．A．must stay upB．should stay upC．
题型：不详难度：来源：
He is an hour late by now．He last night．| A．must stay up | B．should stay up | | C．must have stayed up | D．should have stayed up |
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答案
| C |
解析
| 考查虚拟语气。句意：到现在他已经迟了一个小时。他昨晚肯定熬夜了。“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”。故选C。 |
举一反三
---Be careful! Your clothes will catch fire.
---Thank you._______ so close to the fire.| A．I didn’t know I was | B．I don’t know I am | | C．I hadn’t known I was | D．I don’t know I was |
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_____, we would go on a picnic.| A．The weather is fine | B．Should the weather be fine | | C．The weather be fine | D．Would the weather be fine |
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―Is that Miss Liu having dinner over there?
―It be her. She has gone to New York for an important business meeting.| A．mustn’t | B．needn’t | C．can’t | D．shouldn’t |
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| You look so tired. You _________ have stayed up again. |
How he _______ get out of the prison ______ a mystery.| A．could; is | B．can; is | C．was able to; remains | D．able to; remain |
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