— Do you know the people?  

— Yes, they _____ English teachers in our school.   [ ]

A. are all          

B. both are            

C. are both

在下列各句横线处，依次填入最恰当的词语．*

A．鞭挞变幻便捷

B．鞭挞变更便捷

C．鞭笞变幻便利

D．鞭笞变更便利