15. Children's  brains cannot  develop properly    they lack protein.

A, because      B. since

C. when       D. unless

15.   C考査狀語(yǔ)從句的連接詞。句意：如果孩子缺少蛋白質(zhì)， 他們的大腦就不能適當(dāng)?shù)匕l(fā)育。when引導(dǎo)的是一個(gè)條件狀語(yǔ)從句，相當(dāng)于if 。 because因?yàn)�；since自從，因?yàn)�；unless除非。所以選C。

題目來源：2015全品語(yǔ)法快練高中英語(yǔ)新課標(biāo) > 訓(xùn)練2狀語(yǔ)從句

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