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Let us suppose that we _____him about it, what would have ha

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Let us suppose that we _____him about it, what would have happened?
A.had not told B.did not tell C.will not tell D.don’t tell
A

考查时态。句意:让我们假设我们不曾告诉他这件事,会发生什么事?可知从句内同叙述的是一个已经在过去完成的动作,故用过去完成时态。选A。