Peter saw a little boy---on the corner of the street.为什么答案是crying?哪位好心的能给我讲一下呢?

问题描述:

Peter saw a little boy---on the corner of the street.为什么答案是crying?哪位好心的能给我讲一下呢?
拜托讲得仔细一点,我非常急!

see sb doing sth:看见某人正在做某事.侧重动作的进行.
see sb do sth :看见某人做某事,侧重结果.