【題目】After losing contact for twenty years, they met again _________ in a party．

A. by mistake B. by coincidence

C. on purpose D. on display

【答案】B

【解析】試題分析：考查介詞詞組辨析。A．by mistake錯(cuò)誤地 B．by coincidence偶然地，碰巧C．on purpose故意地D．on display公開(kāi)展出；句意：在失聯(lián)了二十年后，他們偶然地又一次在派對(duì)上碰到。根據(jù)句意，故選B.

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