_______ basic first-aid techniques will help you respond quickly to emergencies.
A．KnownB．Having known C．KnowingD．Being known
C

試題分析：考查動(dòng)名詞做主語：分析句子成分，可知謂語是will help，所以前面的是主語，用動(dòng)名詞做主語。句意：了解基本的急救知識(shí)可以讓你盡快的回應(yīng)緊急狀況。所以選C。
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