问题
选择题
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
答案：D
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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