11.__________ the experiment right,I tried again and succeeded.( )
A. | Not having done | B. | Having not done | C. | Not doing | D. | Not done |
7.-Can you read the sign,sir?No smoking allowed in the waiting room!
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A. | Pardon me | B. | Forget it | ||
C. | Don't mention it | D. | Sure,I don't smoke |