This is the best book that there is on the subject可以解释一下这个句子吗,新原题是This is the best book------- on the subject.A.which there is B.that there is C.which is D.what is

This is the best book that there is on the subject可以解释一下这个句子吗,新原题是This is the best book------- on the subject.A.which there is B.that there is C.which is D.what is
This is the best book that there is on the subject可以解释一下这个句子吗,新
原题是This is the best book------- on the subject.
A.which there is B.that there is C.which is D.what is

This is the best book that there is on the subject可以解释一下这个句子吗,新原题是This is the best book------- on the subject.A.which there is B.that there is C.which is D.what is
应为强调句,this is the best book on the subject.看了一会儿才反应过来.

应当填 C.which is , 这个句子的意思是：这是一本这个学科中最好的书。