—Does he know how to work out the problem ?
—Yes , he has a good idea to solve it .
A. caught up with
B. kept up with
C. e up with
D. put up with
网友回答
A. caught up with
B. kept up with
(答案→)C. e up with
D. put up with
解析：catch up with：跟上，赶上；keep up with：跟上；e up with 找到，想起；put up with：容忍.忍受，他已找到了解决问题的方法。故选项C。