In time of serious accidents, ________ we know some basic things about first aid
题型：不详难度：来源：
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 |
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答案
| C |
解析
试题分析:句意：面对严重的事故，如果我们懂得一些基本的急救知识，我们就可以挽救生命。A是否，即使；B直到；C如果；D除非。根据句意可知前句是后句的假设条件，故答案选C。 |
举一反三
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