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:

if引導(dǎo)條件狀語(yǔ)從句，意為“如果”，知道一些急救的基本知識(shí)是能夠搶救生命的的條件，所以用if引導(dǎo)條件狀語(yǔ)從句。whether引導(dǎo)名詞性從句或讓步狀語(yǔ)從句。until意為“直到”，表示動(dòng)作持續(xù)到until從句的動(dòng)作開(kāi)始。unless意為“如果不，除非”，與所提供的情景矛盾。

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