新概念二册52将答案用括号的词连起.Why has this proved difficult?Do they cover every inch of floor space at the moment or not?(because.which)

问题描述:

新概念二册52
将答案用括号的词连起.
Why has this proved difficult?Do they cover every inch of floor space at the moment or not?(because.which)

It is difficult to clean up the new room because the authour own over a thousand books,which should be put in a very small room.The author have to walk on the books because they cover every inch of fl...