题目内容：

i saw her ____into the library when i was walking past
A.enter B.coming C.go D.come
选B还是C,根据see sb do sth 和 see sb doing sth似乎B ,C都行
改选什么啊!

优质解答

I saw her （B.coming） into the library when I was walking past.
当我经过图书馆时,我看见她正在进去.
see sb do,看见某人做了某事.see sb doing,看见某人正在做.
根据when时间状语,这里还是应该强调动作正在进行更好.