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问题: 一道英语题

___ the teather's advice,he wouldn't have failed in the exam.
A.If he failed B.Had he failed to follow C.Had he followed D.Should he follow
为什么答案选C

解答:

这是虚拟语气呀,当然前面要用过去完成时了.而且句意上:如果他听老师的建议,他就不会考试失败的.也要用follow.