题目内容

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

试题分析：考查动名词做主语：分析句子成分，可知谓语是will help，所以前面的是主语，用动名词做主语。句意：了解基本的急救知识可以让你尽快的回应紧急状况。所以选C。
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