basic fist-aid techniques will help you respond quickly to emergencies.

A. Known B. Having known

C. Knowing D. Being known

C

【解析】

試題分析：考查現(xiàn)在分詞短語做作主語。動(dòng)詞的現(xiàn)在分詞可以作主語，表示動(dòng)作的進(jìn)行時(shí)，或者強(qiáng)調(diào)動(dòng)作。這里know basic fist-aid techniques 了解基本的急救技術(shù)，know，vt，知道，了解，是一個(gè)直接的動(dòng)賓結(jié)構(gòu)，所以可以直接用know的現(xiàn)在分詞形式作主語。句意：了解基本的急救技術(shù)將會(huì)幫助你對(duì)緊急情況作出快速反應(yīng)。故選C。

考點(diǎn)：考查現(xiàn)在分詞短語做作主語

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