问题

Please keep your mobile phones_______ while having a meeting.
A:clean it up
B:clean up it
C:to clean it up
D:to clean up it;
B:clean up it
C:to clean it up
D:to clean up it;
正确答案是:
同类题型
What made you so delighted at Christmas—
The environment of the city is very good, You can see many trees on________side of the street.
What a pity! When we got to the cinema,the movie The Assembly,so we saw only the end of it
Some Chinese words, ____________ Tuhao and Dama, were added to some English dictionaries in 2014.
He was told that it would be at least three more months _______he could recover and return to work.