摘要： 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
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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
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