问题

We must keep our room clean. Dirt and disease go , you know.

A:from time to time
B:hand in hand
C:step by step
D:one after another

正确答案是：

同类题型

I knocked on the door but answered.

I really appreciatetodrive me home，but I am afraid that I have to finish mywork first now

Not until the car looked almost new____cleaning it.1网

We had to stay at home ________ a heavy rain

___ , he still put people’s life in the first place.