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    精英家教网 > 高中英语 > 题目详情
    Tom ____his homework yesterday, because he was in hospital all day.
    A．can’t finishB．couldn’t finishC．couldn’t have finishedD．mustn’t finish
    C

    试题分析：考查情态动词表示推测。根据第二句的过去时，说明是对过去的推测，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，使用“情态动词+动词原形”；句意：Tom不可能完成他的家庭作业，因为他整体都住院。故C正确。
    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，使用“情态动词+动词原形”；
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