直到看见妈妈,这个小孩才停止了哭泣.

问题描述:

直到看见妈妈,这个小孩才停止了哭泣.
The little child din't stop crying until he had seen his mother.
为什么用had seen,不用saw?

自己慢慢悟,英语狠奇妙!