Children's brains cannot develop properly they lack protein.A, because B. sinceC. when D. unless 题目和参考答案——青夏教育精英家教网—

题目内容

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

A, because B. since

C. when D. unless

15. C考査状语从句的连接词。句意：如果孩子缺少蛋白质，他们的大脑就不能适当地发育。when引导的是一个条件状语从句，相当于if 。 because因为；since自从，因为；unless除非。所以选C。

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