问题
We should often keep _____ touch with each other, because we are good friends. [ ]
A: on
B: to
C: in
D:up
B: to
C: in
D:up
正确答案是：
同类题型
There isn’t _____ water in the glass. Could you get_____ for me?
Do you know where the movie star is ________? —Oh, he is making a movie in Shanghai.[ ]
I often see lights in that empty house. So you think I ______ report it to the police?
Our teachers think Jim the best student. The sentence structure is _______