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In time of serious accidents,______ we ...

 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】:根据题意可以看出,只有了解了基本的急救知识才能在事故发生的时候救人。Unless和if not相等,whether只有在表示是否这个意思的和if相同;until是直到一般多引导时间状语从句。 【考点】:状语从句的引导词的选择。 【易错点】:因为if和whether有能够通用的地方,容易错选A;而且unless = if not有些同学没有掌握好就错误的选择了unless. 【备考建议】:状语从句有时间、地点、方式、伴随、原因、让步、目的等等等几种,对于每一种都要把其重点的引导词的意义掌握好,其实掌握好汉语的状语对英语也有好大的帮助。
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