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_______ 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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