—Where _____ Mary have put the empty bottles? — She _____ them away. They must b
题型：不详难度：来源：
—Where _____ Mary have put the empty bottles?
— She _____ them away. They must be somewhere. | A．can; can’t have thrown | B．must; needn’t | | C．must; must have thrown | D．can; mustn’t have thrown |
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答案
| A |
解析
试题分析：考查情态动词ｃａｎ的用法：ｃａｎ＋完成时，表示推测的时候，ｃａｎ用于疑问和否定句，第一空是用于疑问句，用ｃａｎ，第二空是用于否定句，ｃａｎ＇ｔ ｈａｖｅ ｄｏｎｅ过去不可能做了什么，句意：玛丽把空瓶子放在哪里呢？――她不可能扔了的。一定在什么地方。选Ａ。
点评：使用“情态动词+have done”对过去的情况进行推测。如果是对现在情况的推测或虚拟，使用“情态动词+动词原形”； |
举一反三
—Mary broke up with me!
—You____ have forgotten about the Valentine"s Day．| A．shouldn"t | B．couldn"t | C．needn"t | D．mustn"t |
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| He _____ have fallen asleep last night because he didn’t hear the phone call. |
| Please do not feed the fish; they ________ die if they eat too much. |
He bought another new car. He _____ a lot of money.| A．must earn | B．must have earned | C．can earn | D．could have earned |
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— Do you know where Miss Gao is? I couldn’t find her anywhere.
— She ________ have gone far, for her coat is still here.| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
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