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    精英家教网 > 高中英语 > 题目详情
    —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 thrownD．can; mustn’t have thrown
    A

    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”；
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