英语三级B级
单选题___________ had enough time，they would have visited the Great Wall。
参考答案：A进入在线模考
答案选A。句意：如果他们有足够的时间，他们就去参观长城了。本题考查的是虚拟语气。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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