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. while
C. since
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. while
C. since
D. until
答案：D