I think it is one of the most useful ______(dictionary)请问这个dictionary要加s吗?

问题描述:

I think it is one of the most useful ______(dictionary)请问这个dictionary要加s吗?

用阿,就是说这一本dic是所有之中最有用的,那么这个所有的辞典肯定就是不知一本喽.所以用复数.