问题 选择题

Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.

A.a  

B.what   

C.it

D.which

答案

答案:D

答案:D。考查定语从句。此处which引导非限制性定语从句,同时在从句中作主语。

单项选择题
单项选择题