题目内容
【题目】By the time Jack returned home from England, his son .
A. graduated B. has graduated
C. had been graduating D. had graduated
【答案】D
【解析】
试题分析:考查时态。句意:杰克从英格兰回到家时,他的儿子已经大学毕业了。by the time...“到……的时候”引导时间状语从句时,如果从句的谓语动词用一般过去时,主句的谓语动词要用过去完成时,故选D项。
考点 : 考查时态
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