ther staff ____to wear uniforms in the office 为什么用are asked
问题描述：
ther staff ____to wear uniforms in the office 为什么用are asked
答
be asked to do sth 被要求做某事
The staff are asked to wear uniforms in th office.
意思是：员工们在办公室要穿工作服.
uniforms 是复数,因此 the staff 这里代指复数,系动词用are