I bought the books which were very expensive.(针对划线部分提问,which were very expensive是划线部分
问题描述：
I bought the books which were very expensive.(针对划线部分提问,which were very expensive是划线部分
答
which book you bought？
or
what is about the book you bought？
答
What kind of books did you buy
答
Which books did you buy
答
What kind of books did you buy?