when I saw等于什么

问题描述:

when I saw等于什么
I was excited when I saw so many people when I saw so many books in bookstore.
改写成I was excited when I saw so many people _______so many books in bookstore.
保证句意不变
.
I was excited when I saw so many books in bookstore.
I was excited ———— so many books in bookstore.

when I saw = when I was seeing (过去进行时)