_______ basic first-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：句意：了解基本的急救技術(shù)將幫助你對(duì)緊急情況作出迅速反應(yīng)。Knowing basic first-aid techniques是動(dòng)名詞短語(yǔ)做主語(yǔ)。A. Known過(guò)去分詞表被動(dòng)完成；B. Having known做狀語(yǔ)，表動(dòng)作在先；C. Knowing 和后面的basic first-aid techniques一起構(gòu)成短語(yǔ)做主語(yǔ)；D. Being known是現(xiàn)在分詞的被動(dòng)形式。由句意可知選C。

考點(diǎn)：考查動(dòng)名詞做主語(yǔ)的用法。

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