B pair a new，说明后面是单数，排除C trousers，it是物主代词前面是不能接形容词的，排除D。trousers——裤子，是复数，说明要用pair（一双）代替，排除A，选B。————————————权威解答，希望采纳
Mum,my trousers are old. I want to buy a new( ? ) A one B pa
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