．--- 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 |
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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 |
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