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题目内容
（华北水利水电大学英语）
What is the expressioof “mind their p’s and q’s” supposed to mean( )
· To mind their owbusiness.
· To remember to say “please”.
· To remember to say “thank you”.
· To be well-mannered.
· To mind their owbusiness.
· To remember to say “please”.
· To remember to say “thank you”.
· To be well-mannered.
参考答案
