题目内容
【题目】By the time Jack returned home from England, his son __________ from college.
A. graduated
B. has graduated
C. had been graduating
D. had graduated
【答案】D
【解析】句意:到杰克从英格兰返回家时,他的儿子已大学毕业。本题考查时态。根据句意可知,设空处说的是过去的事情,故用过去时,排除B项;设空处的动作( graduate)先于returned这一动作,表示“过去的过去”,故用过去完成时。
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