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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
本題考查動詞時態(tài)。句意為“當杰克從英國返回家時，他的兒子已經大學畢業(yè)了�！眀y the time到…時候為止，一般與完成時連用。選D。
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