(2013·福建高考)________basic first­aid techniques will help you respond quickly to emergencies.
A．KnownB．Having known
C．KnowingD．Being known
C
選C　考查非謂語動詞。句意：了解基本的急救技巧能夠幫助你快速應(yīng)對緊急情況。分析句子結(jié)構(gòu)可知，空處在句中充當(dāng)主語，應(yīng)用動詞­ing形式。having known強調(diào)“完成”，不符合句意，可排除。故選C。
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