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

句子成分完整且表意确定时选用that连接,句意不确定时选用whether/if连接;借助it,将真正主语或宾语后置,构成“It…that”句型,但whether/if不可。