问题
选择题
By the time Jack returned home from America, his son __________ from college. [ ]
A. graduate
B. has graduated
C. had graduated
D. had been graduated
答案
答案：C
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By the time Jack returned home from America, his son __________ from college. [ ]
A. graduate
B. has graduated
C. had graduated
D. had been graduated
答案：C