题目内容

Children’s brains can’t develop properly_______ they lack protein(蛋白质).
A．whenB．sinceC．becauseD．unless
A
 本题考查when的一个特殊用法。在本题中的when引导的是一个条件状语从句，相当于if。整个句子的意思是：如果孩子缺少蛋白质，大脑就不能正常发育。
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