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

A. because B. since

C. when D. unless

【答案】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。

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