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
The teacher doesn' t permit ______ in class.
A．smoke
B．smokes
C．to have a smoke
D．smoking
单项选择题
Hospital doctors don' t go out very often as their work takes ______ their time.
A．away
B．over
C．in
D．up
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