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

A, because      B. since

C. when       D. unless

15.   C考査狀語從句的連接詞。句意：如果孩子缺少蛋白質， 他們的大腦就不能適當地發(fā)育。when引導的是一個條件狀語從句，相當于if 。 because因為；since自從，因為；unless除非。所以選C。

題目來源：2015全品語法快練高中英語新課標 > 訓練2狀語從句

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