The wording of the contract is so vague that no one ______knows

The wording of the contract is so vague that no one ______knows what this document is all about.
A、simply
B、actually
C、eventually
D、firstly
【正确答案】：B
【题目解析】：此句的意思是这份合同的用词很模糊，导致没有一个人知道文件实际是干什么的。Simply表示简单地；actually指实际上，事实上；eventually指最终地，终究；firstly指首先，第一。根据句意选B。