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—You should have come to the party last Saturday evening.It

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—You should have come to the party last Saturday evening.It was really wonderful.
—But a friend ________ an unexpected visit to me.
A.paid \x05 B.had paid C.would pay D.has paid
为什么不用完成时,说话者不是强调影响吗?
答案A
解析: 从you should have come 应该做而没做, 推断,这里是和过去事实相反虚拟.所以答句用一般过去时.
现在完成时表示 动作已经完成,对现在产生影响. 这里并体现影响在哪