"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，關(guān)掉水龍頭。對不起，我馬上做。A. until 直到……為止，B. while 與……同時， C. during 在…..期間，據(jù)句意，故選B。
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