--- Hurry up. The bus is coming. --- Oh no. We mustn’t cross the street the traffic light

问题补充：

--- Hurry up. The bus is coming.

--- Oh, no. We mustn’t cross the street the traffic lights are green.

A. until

B. since

C. while

D. after

答案：

(答案→)A. until

B. since

C. while

D. after

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