That book is a story-book. That book has a red cover.(合并一句)这样的形式:That book____has a red cover____a story-book.

问题描述:

That book is a story-book. That book has a red cover.(合并一句)
这样的形式:That book____has a red cover____a story-book.

which, is

那本书是一本故事书。那本书有一个红色封面

That book which has a red cover is a story_book