After a second thought, Bill a better idea of how to solve the problem.
A. put up with
B. kept up with
C. came up with
D. mixed up with
网友回答
A. put up with
B. kept up with
(答案→)C. came up with
D. mixed up with
解析：考查词组：A. put up with容忍B. kept up with跟上C. came up with想出，提出，D. mixed up with和…混淆，句意：再一想，Bill想出了更好的解决问题的主意。选C。