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】D　[考查表語從句。句意：傳統(tǒng)觀點認為，我們之所以睡覺是因為大腦中有“程序”讓我們這么做。此處不缺少任何成分，故排除A、B；表語從句中的內(nèi)容是確定的，故排除C。]

 

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