题目内容

By the time Jack returned home from America, his son __________ from college.
A．graduateB．has graduatedC．had graduatedD．had been graduated
C
考查时态。By与完成时连用，本题by后面是表示过去的时间，所以使用过去完成时。句意：到JACK回到美国的时候，他儿子已经大学毕业了。
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