题目内容

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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