单项选择题

My father ______ for a long time.

A．is smoking
B．smokes
C．smoked
D．has smoked
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单项选择题
Later he ______ to know her better.
A．became
B．came
C．was
D．went
单项选择题
Not until ten o'clock ______ the office.
A．did we leave
B．we did leave
C．we left
D．we didn't leave
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