By the time Jack returned home from England, his son __________from college. A.graduatedB.has gradua

题目简介

By the time Jack returned home from England, his son __________from college. A.graduatedB.has gradua

题目详情

By the time Jack returned home from England, his son __________from college.
A.graduatedB.has graduated C.had been graduatingD.had graduated
题型:单选题难度:中档来源:不详

答案

D
本题考查动词时态。句意为“当杰克从英国返回家时,他的儿子已经大学毕业了。”by the time到…时候为止,一般与完成时连用。选D。

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