We must keep our room clean. Dirt and disease go        , you know.
#83346
A
from time to time
B
hand in hand
C
step by step
D
one after another
推荐题目
He________after a few days’ treatment in hospital.
#70065
A
picked up
B
made up
C
took up
D
looked up
I’m not going to ________ their smoking any longer.
#70903
A
catch up with
B
put up with
C
end up with
D
keep up with