单项选择题

Shortly after the accident, two ______ police were sent to the spot to keep order.

A. dozens of
B. dozens
C. dozen of
D. dozen
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单项选择题
Over the past three decades the Chinese people have ______ wonders, which contributes to the economic reforms.
A. worked
B. created
C. invented
D. discovered
单项选择题
I practiced the speech well, so I didn’t feel ______ when I was speaking.
A. relaxed
B. disappointed
C. nervous
D. tired
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