―Has the police known about the accident?

―Yes. They ________ immediately.

A. informed                                        B. were informed  

C. have informed                                D. were informing

--- ________ the police known about the accident?

　 --- Yes. ____________ informed immediately.

　 A. Has, They were　 B. Have, They were　　　 C. Has, It was　　　 D. Have, It was