单项选择题

The police knew nothing about the case ______ your father phone them.

A．after
B．since
C．as
D．until
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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
单项选择题
The teacher doesn' t permit ______ in class.
A．smoke
B．smokes
C．to have a smoke
D．smoking
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