By the time Jack returned home from England, his son. from college.A.graduatedB.has graduatedC.had b

题目简介

By the time Jack returned home from England, his son. from college.A.graduatedB.has graduatedC.had b

题目详情

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

答案

D
考查动词时态,By the time 截止到过去某时间为止做了某事,用过去完成时态。 A是一般过去时;B是现在完成时;C是过去完成进行时。根据句子意思“截止到Jack从英国返家,他的儿子已经大学毕业了。

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