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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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
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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