问题
选择题
Unless you work as hard as you can, you won’t ______ your classmates.
A.fall behind
B.keep on with
C.keep up with
D.catch up
答案
答案:C
本题的含义是如果你不尽可能地努力学习,你将不能赶得上你的同班同学,keep up with表示赶得上的意思,符合本题的含义,故本题选C。