问题

Living in the mountain area has its problems, ________ obtaining water is a big problem.

A:of which
B:for what
C:as
D:whose

正确答案是：

同类题型

He________ for two years. We are still sad about his _________.

We don’t doubt ________ the boy can ________ the angry teacher. [ ]

The man didn’t know _________ the thief broke into the house and stole all his valuable things

I have _________about it.

My birthday is ______ May and his birthday is ______ March 26th.