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【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...……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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