We ues erasers ____ the blackboard.说明原因A.clean B.cleans C.to clean D.cleaning

We ues erasers ____ the blackboard.说明原因
A.clean B.cleans C.to clean D.cleaning

use sth. to do sth.固定句式
不知道你这是用哪个动词,题里给了没?没的话就
to erase或者 to clean