改同义句:At last,children came up with a good solution to the problem.At last,children _____ _____ a good solution to the problem.答案填thought up,请问能不能填thought out?为什么?

问题描述:

改同义句:At last,children came up with a good solution to the problem.
At last,children _____ _____ a good solution to the problem.
答案填thought up,请问能不能填thought out?为什么?