By the time Jack returned home from England, his son________from college.[ ]A. graduatedB. has graduatedC. had been graduatingD. had graduated-高中英语-n多题

◎ 题干

By the time Jack returned home from England, his son________from college.

[ ]

A. graduated
B. has graduated
C. had been graduating
D. had graduated

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◎ 解析

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◎ 知识点

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