By the time Jack returned home from England, his son _____from college. [ ]A. graduated B. has graduated C. had been D. had graduated -高中英语-魔方格

◎ 题干

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

[ ]

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

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◎ 解析

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◎ 知识点

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