单项选择题

Mary saw her son（）the piano when she came to the room.

A. playing
B. play
C. played
D. to play

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单项选择题

I prefer the climate in Kunming to （） in Wuhan.

A. one
B. those
C. the one
D. that

单项选择题

Can you ask your neighbors for help I'm afraid not. I（）know any of them.

A. hardly
B. just
C. seldom
D. only

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