问题
选择题
— Hurry up,. The bus is coming.
— Oh, no. we mustn't cross the street ________ the traffic lights are green. [ ]
A. after
B. since
C. while
D. until
答案
答案：D
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— Hurry up,. The bus is coming.
— Oh, no. we mustn't cross the street ________ the traffic lights are green. [ ]
A. after
B. since
C. while
D. until
答案：D