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
D．had graduated
答案
答案：D
考查时态题。by the time +从句（过去时），主句用过去完成时。故答案选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
D．had graduated
答案：D
考查时态题。by the time +从句（过去时），主句用过去完成时。故答案选D。