单项选择题

There are ______ visitors in the exhibition every day.

A. hundred
B. hundreds of
C. hundreds
D. a hundred of
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单项选择题
For a person with reading habits，a printed page contains not only words ______ ideas， thoughts and feelings．
A．yet
B．and
C．or
D．but
单项选择题
Shortly after the accident, two ______ police were sent to the spot to keep order.
A. dozen of
B. dozens
C. dozen
D. dozens of
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