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【题目】_________basic first-aid techniques will help you respond quickly to emergencies.
A.Known
B.Having known
C.Knowing
D.Being known

【答案】C
【解析】句意:了解基本的急救知识可以让你尽快的回应紧急状况。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,故选C项。

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