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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单项选择题
The cotton production has increased by ______ percent this year compared with last year.
A. five point six eight
B. five point sixty-eight
C. fifth point and six eight
D. five point and six eight
单项选择题
Mary was the ______ of the ______ students climbed up to the top of the hill．
A．nine；fourty
B．nineth；fortieth
C．ninth；forty
D．nine，fortieth
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