【題目】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】

試題分析：考查時態(tài)。句意：杰克從英格蘭回到家時，他的兒子已經(jīng)大學畢業(yè)了。by the time...“到……的時候”引導時間狀語從句時，如果從句的謂語動詞用一般過去時，主句的謂語動詞要用過去完成時，故選D項。

考點 : 考查時態(tài)

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