——Work hard,or you will_____others in class.——Ok,I'll try my best.——Work hard,or you will_____others in class.——Ok,I'll try my best.A.fall offB.fall behindC.fall overD.fall down

问题描述:

——Work hard,or you will_____others in class.——Ok,I'll try my best.
——Work hard,or you will_____others in class.
——Ok,I'll try my best.
A.fall off
B.fall behind
C.fall over
D.fall down