By the time Jack returned home from England, his son __________from college.

A.  graduated    B. has graduated    C. had been graduating D. had graduated

 

【答案】

D

【解析】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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