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        1. "Mary, turn off the water_________you are brushing your teeth. "  "Sorry, I'll do it at once. "
          A. until          B. while          C. during
          B

          試題分析:句意: 瑪麗,當(dāng)你刷牙時(shí),關(guān)掉水龍頭。對(duì)不起,我馬上做。A. until 直到……為止,B. while 與……同時(shí), C. during 在…..期間,據(jù)句意,故選B。
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