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Children’s brains can’t develop properly_______ they lack protein
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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