Children’s brains can’t develop properly_______ they lack protein(蛋白质).A．whenB．s
题型：不详难度：来源：
Children’s brains can’t develop properly_______ they lack protein(蛋白质).| A．when | B．since | C．because | D．unless |
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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。 |
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