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By the time Jack returned home from England, his son  _______  from college.
A.graduatedB.has graduatedC.had been graduatingD.had graduated
D

试题分析:句意:当杰克从英国回家为止,他的儿子已经从大学毕业了。by the time …当……的时候,……
通常引导一个时间状语从句,表示“到……的时候”主句则表示在此时间之前某个事件已完成。值得注意的是,当从句用过去时时,主句通常用过去完成时。选D。
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