题目内容

The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
A．whenB．whyC．whetherD．that
D
主要测试表语从句。结合语境可知句子意思为：传统的观点是因为我们的大脑已经设定好让我们睡觉，所以我们睡觉。由以上译文可知句子中并不缺少任何成分只是少了应道表语从句的引导词。
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