He is the only one of the works who----chinese.A.speak Bspeaks

问题描述:

He is the only one of the works who----chinese.A.speak Bspeaks
WHY?
the workers又是什么?

B
定语从句
who speaks chinese修饰the one(介词不做主语)
the only one of the workers解释为仅仅其中一个工人(of the workers只是一个范围,不是主语)