单项选择题

Be quiet and ______ your work.

A. you do
B. to do
C. do
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单项选择题
We won’t go to the Great Wall if ______.
A. it rains
B. it will rain
C. it is raining
单项选择题
Do you know ______ people in the business
A. another
B. others
C. other
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