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
He told me his digestive trouble is cured ______ and all.
A. for long
B. for life
C. for ever
D. for good
单项选择题
The police are suspicious ______ his words because he already has a record.
A. to
B. at
C. on
D. of
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