单项选择题

The professor needs an assistant that he can______ to take care of problems in his absence.

A．count in
B．count up
C．count on
D．count out

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单项选择题

Because of the cold weather, they______ through the night in the camp.

A．kept the burning fire
B．kept the fire burning
C．kept the fire burnt
D．kept burning the fire

单项选择题

I am not sure whether I can get any profit from the business, so I can't make a(n)______ decision abut what to do next.

A．exact
B．denied
C．sure
D．definite

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