The traditional view is ______ we sleep because our brain is “programmed” to make us do so.

A. when            B. why              C. whether              D. that

D


解析:

主要測試表語從句。結(jié)合語境可知句子意思為：傳統(tǒng)的觀點是因為我們的大腦已經(jīng)設定好讓我們睡覺，所以我們睡覺。由以上譯文可知句子中并不缺少任何成分只是少了應道表語從句的引導詞。

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