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

题目简介

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

题目详情

In time of serious accidents, _______ we know some basic things about first aid,we can save lives.
A.whetherB.until
C.ifD.unless
题型:单选题难度:中档来源:不详

答案

C
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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