His teacher is trying to reduce his fear _ he would fail in the final exam.A which B what C that

题目

His teacher is trying to reduce his fear _ he would fail in the final exam.A which B what C that

答案

C that
理由是：引导从句时,不表示成分的引导词只有that,which和what都要充当一定句子成分,从句不缺任何成分
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