The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.

A．had been repairing

B．was repairing

C．has been repairing

D．would be repairing

邮政支局根据服务人口、年邮政业务收入和通信总量，分( )。

A．一等支局

B．二等支局

C．三等支局

D．四等支局

E．特等支局