题目

 The traditional view is _______ we sleep because our brain is “programmed” to make us do so. A. when                         B. why                         C. whether                   D. that 答案: D  that引导表语从句,在从句中只起连接作用,不作任何成分。we sleep because our brain is “programmed” to make us to so是一个完整的句子,所以要用that引导。when和where在表语从句中作状语,分别表示“在……的时候”和“在……地方”。whether意为“是否”。
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