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—Do you think the thief entered through the back door?
—No, if he had, I don’t believe he ______ the living-room window.
A.would breakB.brokeC.would have brokenD.had broken
C

试题分析:考查情态动词用法。句意:—你认为小偷是从后门进来的吗?—不,如果他从后门进来,我认为他不会打破起居室的窗户。根据句意说明是对过去事实的推测,对过去情况进行推测使用“情态动词+have done”的形式。故C正确。
点评:情态动词的用法比较复杂。突出的是表示推测:如果是对现在的情况进行推测,使用“情态动词+动词原形”;对过去的情况进行推测,使用“情态动词+have done”;情态动词也经常用于虚拟语气,要分具体情况来分析,在条件句中和宾语从句,表语从句中都有体现。
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