单项选择题

The house isn't comfortable tonight ______our air conditioner is not working.

A．so
B．because
C．once
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单项选择题
There are ______tigers in the forest, and only a small number of monkeys.
A．a great number
B．a few of
C．a great number of
单项选择题
The dentist said there wasn't ______ wrong with her teeth.
A．something
B．nothing
C．anything
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