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选B 的原因A:Peter didn't come to the meeting this morning?B:I___

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选B 的原因
A:Peter didn't come to the meeting this morning?
B:I____him yesterday ,but I was too busy and forget.
A should tell B should have told
C had to tell D had told
选B 的原因A:Peter didn't come to the meeting this morning?B:I___
虚拟语态,原本应该告诉的,但事实没有告诉.
表示与过去事实相反的假设,从句中用过去完成式,主句中用过去将来完成式(should,would,could,might + have + 过去分词).如:
J If I had set off a little earlier,I would have caught the train.
J She would / might have come if she hadn't been so busy.
J If I hadn't taken your advice,I would have made a bad mistake.
J If only you hadn't told him the news.