题目

It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.     A. that     B. what     C. which    D. where 答案：C 解析: 考查定语从句，which引导定语从句指代前面的句子，并且在定语从句中做主语。

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