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Children’s brains cannot develop properly _________ they lack protein.
A.becauseB.sinceC.whenD.unless
C

试题分析:整个句子的意思是:如果孩子缺少蛋白质,他们的大脑就不能适当的发展。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,所以选C。
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