问题描述：
there are many kinds of books in his study.（对划线部分提问：划线部分为many kinds of books)
----what ___in his study?空格处是is,可为什么不用are?
----what ___in his study?空格处是is,可为什么不用are?
问题解答：
我来补答展开全文阅读