My sister met him at the cinema yesterday afternoon, so heyour lecture.A. couldn’t have at

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

(答案→)A. couldn’t have attendedB. needn’t have attendedC. mustn’t have attendedD. 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。

这下我知道了