题文
--Mr.Black used to be a worker,_________?
--Yes,he_______. Now he is a policeman.
| A．did he;did | B．didn’t he;did |
| C．did he; didn’t | D．didn’t he; didn’t |
--Mr.Black used to be a worker,_________?
--Yes,he_______. Now he is a policeman.
| A．did he;did | B．didn’t he;did |
| C．did he; didn’t | D．didn’t he; didn’t |
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