选What's the matter _____ they still haven't answered the telegram?A.when B.that C.though

问题描述:

选What's the matter _____ they still haven't answered the telegram?A.when B.that C.though
D.however

B.that说下为什么嘛many thanks!!!that 引导定语从句。原话可改成:What's the reason why they still haven't answered the telegram?