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She ____ the film. She knows nothing about it.
A.can’tseeB.can’thaveseenC.mustseeD.mustn’thaveseen
B

试题分析:考查情态动词的完成式:根据句意:她不可能看过这个电影,因为她对电影一无所知,可知是对过去的事情的推测,用情态动词的完成式,can’t have done不可能做过…,must表示推测的时候,只能用于肯定句,选B。
点评:情态动词+have done可以表示推测和虚拟:“must+have+done”表示对过去事情的肯定推测,译成“一定做过某事”,该结构只用于肯定句。“can't+have+done”表示对过去事情的否定推测,译成“不可能做过某事”。“may+have+done”表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。“could+have+done”是虚拟语气,表示对过去事情的假设,意思是本来能够做某事而没有做。 “would+have+done”虚拟语气,表示对过去事情的假设,意思是“本来会做”。
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