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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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