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    Children’s brains cannot develop properly _________ they lack protein.

    A. because B. since

    C. when D. unless

     

    C

    【解析】

    试题分析：考查连词辨析。在本题中的when引导的是一个条件状语从句，相当于if。Because因为，since自从，因为，unless除非。句意：如果孩子缺少蛋白质，他们的大脑就不能适当的发展。故C正确。

    考点：考查连词辨析

     

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