The reason ( )he did not come is ( ) he was ill

问题描述:

The reason ( )he did not come is ( ) he was ill
A,that,why B,that ,that C,why,that D,why,which

选C
why引导后面的从句说明reason,很常见的组合.the reason why ...
is 后面本应该+名词,但因为+的是句子,所以用一个that 引导一下...is that...也很常见……