题目内容

I arrived home at midnight, _______ my parents had been waiting for nearly three hours.
A.at that timeB.by that timeC.at which timeD.by which time
D
这题考查介词和非限制性定语从句,从句式结构看这是非限制性定语从句,又根据从句的时态:过去完成时,可以判断是by,所以填by which time。选D。句意是:我午夜到家,到那时为止我父母已经等了近3小时了。
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