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：  that引導表語從句，用來說明主語的內(nèi)容。根據(jù)句意，空格內(nèi)要填that，說明主語The traditional view的內(nèi)容。

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