______had enough time, they would have visited the Great Wall.A、Had theyB、Have

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问题 ______had enough time, they would have visited the Great Wall.

选项 A、Had they
B、Have they
C、Would they have
D、If they

答案 A

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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