【单项选择题】
I don't know who on()stole the diamond last night.
A、A.world
B、B.earth
C、C.floor
D、D.ground
A、A.world
B、B.earth
C、C.floor
D、D.ground
A、who are you? B、don't ask me. C、I don't know. D、would you please ring them up this afternoon?