"I intended to compare notes with a friend,but unfortunately
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答案A

本题考查人称代词的代指用法.用they代替前面出现过的a friend.虽然a friend是单数,但从说话者的语气看,也可理解为所有的朋友,所以这四个备用选项中A项为最佳选项.one用于泛指,如:I need a friend,one that can comfort me when I am in trouble.it也可用来指人,但它用于“确定身份”.如:“Who came here just now?” “It’s John.”; who是关系代词,引导定语从句,如果用它,应该把题干中的并列连词but去掉.