__________ had enough time, they would have visited the Great Wall.

A．Had they

B．Have they

C．Would they have

D．If they

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参考答案

答案解析

A
【译文】如果他们有足够的时间，他们就去参觌长城了。
【考点】虚拟语气
【解析】本题是省略if的条件句的虚拟语气。由主句谓语动词的形式，可以判断是表示与过去事实相反的虚拟语气的句子，要求选的是条件句。如果用if开头，从句就应用过去完成时的形式，D选项不符合，排除。
虚拟条件从句中的were，had或should可以前置而省略if。故选A。

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