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
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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
单项选择题
With the price of oil (goes up), the economy of (oil-producing) countries is (expanding) (at a high rate).
A．goes up
B．oil-producing
C．expanding
D．at a high rate
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