there are some people (do dth) 还是 doing sth

there are some people (do dth) 还是 doing sth

题目
there are some people (do dth) 还是 doing sth
请用所给词的适当形式填空:
There are several people ( )[look through] books in the bookstore.
此处该填look through还是looking through?
为什么
答案
英语很讲逻辑,如果没有从句,一句话只能有一个动词,此处looking...是修饰people的,只能用现在分词,也可以说people who look...
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