Question

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

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

Answer 1

 D  that引導(dǎo)表語從句，在從句中只起連接作用，不作任何成分。we sleep because our brain is “programmed” to make us to so是一個完整的句子，所以要用that引導(dǎo)。when和where在表語從句中作狀語，分別表示“在……的時候”和“在……地方”。whether意為“是否”。