单项选择题

There is such a rapid increase in the number of private cars as to ______ a gas shortage.

A．causing
B．cause
C．caused
D．being caused
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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
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
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