单项选择题

You should (check) the air in the (tires) (as) you (start on) a long automobile trip.

A．check
B．tires
C．as
D．start on
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单项选择题
Shortly after the accident, two ______ policemen came to the spot.
A．dozen of
B．dozens
C．dozen
D．dozens of
单项选择题
(During the discussion), Mr. White (remained silent) (when) (asking) his opinion.
A．During the discussion
B．remained silent
C．when
D．asking
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