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To our surprise the stranger _____ to be an old friend of my mother’s.

A. turned out         B. turned up  C. set out             D. set up

A


解析:

turn out 意為“結(jié)果是,原來(lái)是”等;turn up 意為“找到, 發(fā)現(xiàn),出現(xiàn),開(kāi)大音量”等;set out 意為“開(kāi)始,出發(fā),陳述”等;set up 意為“設(shè)立,豎立,架起,升起,創(chuàng)(紀(jì)錄),提出”等。

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