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:

表語(yǔ)從句連接詞的選用。that引導(dǎo)表語(yǔ)從句，用來(lái)說(shuō)明主語(yǔ)的內(nèi)容。根據(jù)句意，空格內(nèi)要填that，說(shuō)明主語(yǔ)The traditional view的內(nèi)容。

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