I was on the highway when this car went past followed by a police car.They _______ at least 150 kilometers an hour.?

A. should have been doing

B. must have been doing?

C. could have done?

D. would have done?

I was on the highway when this car went past followed by a police car . They    at least 150 kilometers an hour .

    A．should have been doing           B．must have been doing

    C．could have done                     D．would have done

I was on the highway when this car went past followed by a police car. They ______ at least 150 kilometers an hour.

    A. should have been doing       B. must have been doing

    C. could have done             D. would have done

I was on the highway when this car went past followed by a police car.They　　　　 at least 150 kilometers an hour.

A.should have been doing ?　　　　　　　　　　 B.must have been doing

C.could have done?　　　　　　　　　　　　　　 D.would have done

 I was on the highway when this car went past followed by a police car. They ______ at least 150 km an hour.

   A. should have been doing          B. must have been doing

   C. could have done                D. would have done