He started to walk faster and the children had to run to him.
A. e up with
B. catch up with
C. keep up with
D. put up with
网友回答
A. e up with
B. catch up with
(答案→)C. keep up with
D. put up with
解析： 考查短语辨析。e up with提出，想出，catch up with赶上，keep up with不落在后面，put up with 忍受，句意：他开始走的快一些并且孩子们不得不跑为了部落在他后面。所以选C。