单项选择题

My neighbor ______ the piano; he usually practices at about this time.

A．used to practice
B．would practice
C．is practicing
D．practiced
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单项选择题
These machines ______ on sale the day after tomorrow.
A．are being put
B．are to put
C．will put
D．are to be put
单项选择题
Water power stations are built ______ there are big water falls.
A．in which
B．that
C．in that
D．where
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