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By the time Jack returned home from England, his son __________from college.
A.graduatedB.has graduated C.had been graduatingD.had graduated
D
本题考查动词时态。句意为“当杰克从英国返回家时,他的儿子已经大学毕业了。”by the time到…时候为止,一般与完成时连用。选D。
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