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

试题分析:句意: 玛丽,当你刷牙时,关掉水龙头。对不起,我马上做。A. until 直到……为止,B. while 与……同时, C. during 在…..期间,据句意,故选B。
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