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【題目】________ 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】

試題分析：考查非謂語動詞的用法。動名詞在本句中作主語，此處表示一般情況，用一般式；having known 是完成式，表示動作已經完成或先于謂語動詞發(fā)生。句意為：懂得一些基本的急救技巧將有助于你對緊急情況作出快速應對。

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