_____ basic first-aid techniques will help you respond quickly to emergencies.
A．KnownB．Having knownC．KnowingD．Being known
C
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。
【考點(diǎn)定位】考查動(dòng)名詞做主語。
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