问题
选择题
"Mary, turn off the water_________you are brushing your teeth. " "Sorry, I'll do it at once. "
A. until B. while C. during
答案
答案:B
题目分析: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。