单项选择题

They reported the traffic accident to the policeman who was（）for the night.

A. on duty
B. on time
C. on the sport
D. on watch

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单项选择题
Whose secretary is calling（）

A. Mr. Tom’s.
B. To confirm her boss’s appointment.
C. Mr. Smith’s.
D. Today at two o’clock.
单项选择题
Think it over a few days. You don’t have to make（）your mind right now.

A. out
B. for
C. up
D. on
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