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英语- You should have told him the date earlier,--I_____,but h

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英语-
You should have told him the date earlier,
--I_____,but he forget about it.
A.did B.have C.had D.should have
I want to understand the difference between A and C.(The answer is A)
英语- You should have told him the date earlier,--I_____,but h
A `因为I told him the date是发生在过去的行为 所以应用过去时 而C是现在完成时态 他是强调 行为对事件的影响 可是题中并没有提到啊 所以不选它 你懂了吗