下列哪些句子是正确的?Which/that/as如何运用?
问题描述：
下列哪些句子是正确的?Which/that/as如何运用?
It is such a good book that we can learn much from it.
It is such a good book from which we can learn much.
It is such a good book as we can learn much from.
急求
答
第一个是对的、.such that.因为后面有it 所以不用做宾语,第三个也是对的、因为as作为后面句子里的宾语.第二个好像是对的吧、learn from么!