按要求改写句子 they read books in the library three days ago (用what)

问题描述:

按要求改写句子 they read books in the library three days ago (用what)

what did they do in the library three days ago?

The books what they read three days ago were in the library

they read books in the library three days ago (用what)
wht did they do in the librarh three days ago?

What did they do in the library three days ago?