【题目】_________basic first-aid techniques will help you respond quickly to emergencies.
A. Known B. Having known C. Knowing D. Being known
在线课程【答案】C
【解析】
试题分析：句意：知道基本的急救技术会帮助你快速回应紧急事件。此处是动词-ing的一般主动形式做主语，故选C.
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