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

游客2023-10-02  24

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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