As middle school students, we _____ the police to keep order.
A. are used to help B. used to helping
C. used to help D. used to be helped
As middle school students, we _____ the police to keep order.
A. are used to help B. used to helping
C. used to help D. used to be helped
C
used to do sth. 过去常常做…；be used to doing sth.习惯语做…。