In time of serious accidents, ________ we know some basic things about first aid, we can save lives.
A．whetherB．untilC．ifD．unless
C

試題分析:句意：面對(duì)嚴(yán)重的事故，如果我們懂得一些基本的急救知識(shí)，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。
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