By the time Jack returned home from England, his son_____ from college.A.graduatedB.has graduatedC.h

题目简介

By the time Jack returned home from England, his son_____ from college.A.graduatedB.has graduatedC.h

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
考察时态。根据by the time可知,该处要用完成时,因为by是完成时的标志,后面用什么时态就用什么完成时,所以,根据return可知,该处是用过去完成时

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