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
| 句意为“在遇到严重事故时，如果我们知道一些急救方面的基本知识，我们就能救人命”。If引导条件状语从句表示“如果” 时，不可用whether替换。 |
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