By the time Jack returned home from England.his son from college.(2011·辽宁)A．graduated B．has graduatedC．had been graduating D．had graduated 题目和参考答案——青夏教育精英家教网—

题目内容

By the time Jack returned home from England，his son ________ from college.(2011·辽宁)

A．graduated B．has graduated

C．had been graduating D．had graduated

【解析】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。

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