this is one of the most interesting books___I've read this year

问题描述:

this is one of the most interesting books___I've read this year
A) which B)/ C) about which D)about that
为什么答案是B,我选c为什么不对啊

从句缺宾语,所以可填which that,或不填,因为主句有*the most,所以要么不填,要填只能是that