—Mary broke up with me!—You have forgotten about the Valentine's DayA. shouldn'tB. could

—Mary broke up with me!
—You have forgotten about the Valentine's Day．
A. shouldn't
B. couldn't
C. needn't
D. mustn't

(答案→)A. shouldn'tB. couldn'tC. needn'tD. mustn't解析：考查情态动词用法。“情态动词+have done”既可以表示对过去情况的推测，也可以表示对过去所发生情况的虚拟。有一些固定搭配：Shouldn’t have done本不应该做某事，实际上却做了；couldn’t have done不可能做了某事；needn’t have done本不必做某事，实际上却做了；句意：—Mary和我分手了！—你本不应该忘记这个情人节的！根据句意说明A正确。

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