In time of serious accidents, _______ we know some basic things about first aid,we can save lives.
A．whetherB．until
C．ifD．unless
C?
句意為“在遇到嚴(yán)重事故時，如果我們知道一些急救方面的基本知識，我們就能救人命”。If引導(dǎo)條件狀語從句表示“如果” 時，不可用whether替換。
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