—Jack is not in the office at the moment

—Oh, he ______ those who are going to take the driving test in an hour.

A．can have instructed

B．must have instructed

C．must be instructing

D．will be instructing

组团社有哪些情形之一的，旅游行政部门可以暂停其经营出国旅游业务；情节严重的，取消其出国旅游业务经营资格