My sister met him at the cinema yesterday afternoon, so he your lecture.
A. couldn’t have attended
B. needn’t have attended
C. mustn’t have attended
D. shouldn’t have attended
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(答案→)A. couldn’t have attended
B. needn’t have attended
C. mustn’t have attended
D. shouldn’t have attended
解析:考查情态动词表示推测。“情态动词+动词原形”表示对现在情况的推测;“情态动词+have done”表示对过去情况的推测;根据前半句话说明是对过去情况的推测。句意:我姐姐昨天下午在电影院里遇见了他,所以他不可能去听你的演讲的。故A正确。needn’t have attended本不必做某事,实际上却做了;shouldn’t have attended本不应该做某事,实际上却做了;这两个都表示的是虚拟语气。