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．until
B．since
C．while
D．after
答案
答案：A
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--- 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：A