Bothparentsandteachersworkhardate

发布时间：2020-07-15 16:09:03

Both parents and teachers work hard at either preventing failure or protecting the children．from the knowledge ________ they have failed．A.WhereB.whyC.whichD.that

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A解析考查定语从句。where引导定语从句，并在定语从句中充当状语。
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