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题目
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Children’s brains can’t develop properly_______ they lack protein.
A.whenB.sinceC.becauseD.unless

答案
A
解析
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。
核心考点
试题【Children’s brains can’t develop properly_______ they lack protein.A.whenB.sinceC】;主要考察你对连词等知识点的理解。[详细]
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