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【题目】 basic first-aid skills, according to the expert, will help people respond effectively to emergencies.

A. Known B. Having known

C. Knowing D. Being known

【答案】C

【解析】考查非谓语动词。句意:按着专家说的,了解基本急救技能将帮助人们有效地应对突发事件。根据句意可知此处是动名词做主语,故选C。

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