In time of serious accidents, ________ we know some basic things about first aid, we can save lives.

A．whether B．until C. if D．unless

 

C

【解析】

試題分析:句意：面對嚴重的事故，如果我們懂得一些基本的急救知識，我們就可以挽救生命。A是否，即使；B直到；C如果；D除非。根據(jù)句意可知前句是后句的假設(shè)條件，故答案選C。

考點：考查狀語從句。

 

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