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He lost his left leg.If I ( )more about going first aid,Icou

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He lost his left leg.If I ( )more about going first aid,Icould have helped.
A.knew B.have known C.had known D.would know
说明原因
答案选C.had known
这是if 引导的与过去事实相反的虚拟语气用法
翻译:他失去了它的左腿.如果我能多了解一些急救知识,就可能会帮到他了.