By the time Jack returned home from Engl
问题:
By the time Jack returned home from England,his son ________ from college.(2011·辽宁)
A.graduated
B.has graduated
C.had been graduating
D.had graduated
By the time Jack returned home from England,his son ________ from college.(2011·辽宁)
A.graduated
B.has graduated
C.had been graduating
D.had graduated