单项选择题

He ______ in the army for ten years, and he retired last year.

A．has served
B．had served
C．served
D．had been serving
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单项选择题
I don't think this room will be big enough to ______ all the guests.
A．contain
B．hold
C．keep
D．swallow
单项选择题
It was my father's wish in his will that I ______ become a doctor.
A．should
B．would
C．might
D．could
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