单项选择题

Every policeman and fireman ______ on the alert.

A．have been
B．was
C．are
D．were
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单项选择题
If we don't book tickets, we ______ watch the football game.
A．can't
B．won't be able to
C．may not
D．shouldn't
单项选择题
The possibility of Government's ______ taxes relies on an increased income of the country.
A．lightening
B．light
C．lighting
D．lighted
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