单项选择题

The doctor will not perform the operation_________ it is absolutely necessary.

A．so
B．if
C．for
D．unless
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单项选择题
The question_________ at the meeting tomorrow is very important.
A．to discuss
B．being discussed
C．to be discussed
D．will be discussed
单项选择题
Small talk is a good way to kill time, make friends and____ something with others.
A．argue
B．replace
C．share
D．match
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