12．The young couple，who returned my lost wallet，leftbeforeI could ask for their names．

分析 這對還給我錢包的年輕夫婦，我還沒來得及留下他們的名字就離開了．

解答 答案是  before，考查連詞．before是連詞引導時間狀語從句，意思是"…就/才…"，根據(jù)句意"這對還給我錢包的年輕夫婦，我還沒來得及留下他們的名字就離開了"可知答案是before．

點評 連詞是一種虛詞，分為并列連詞和從屬連詞，本題考查從屬連詞中考查時間狀語的連詞before的用法．

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