__________ had enough time, they would have visited the Great Wall.
- AHad they
- BHave they
- CWould they have
- DIf they
__________ had enough time, they would have visited the Great Wall.
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。