Children’s brains cannot develop properly _________ they lack protein.

A. becauseB. sinceC. whenD. unless

 

C

【解析】

試題分析：整個句子的意思是：如果孩子缺少蛋白質(zhì)，他們的大腦就不能適當(dāng)?shù)陌l(fā)展。在本題中的when引導(dǎo)的是一個條件狀語從句，相當(dāng)于if。Because因為，since自從，因為，unless除非，所以選C。

考點：考查連詞辨析

 

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