_______ 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將幫助你對緊急情況作出迅速反應。Knowing basic first-aid techniques是動名詞短語做主語。A. Known過去分詞表被動完成；B. Having known做狀語，表動作在先；C. Knowing 和后面的basic first-aid techniques一起構成短語做主語；D. Being known是現(xiàn)在分詞的被動形式。由句意可知選C。

考點：考查動名詞做主語的用法。

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