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_____ turned out that this material was neither silk nor cotton.
A.ThatB.ItC.WhatD.Which
B

试题分析:句意:结果表明这种材料既不是丝绸也不是棉。固定句型:it turned out that ……“原来是,结果是”, 在此结构中that this material was neither silk nor cotton.是主语从句,it是形式主语,答案选B。
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