单项选择题

Through the window ______.

A．did the fresh air come
B．came the fresh air
C．did come the fresh air
D．the fresh air come
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单项选择题
There were then more than 200 children ______ music in the school.
A．to study
B．studying
C．study
D．studied
单项选择题
She doesn't know ______ she should go with him.
A．if or not
B．whether or not
C．if not
D．whether not
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