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By the time Jack returned home from England, his son_____ from college.
A.graduatedB.has graduated
C.had beenD.had graduated
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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