— Hurry up. The bus is coming.
— Oh， no. We mustn’t cross the street ________ the traffic light is green.
| A．after | B．while | C．since | D．until |
— Hurry up. The bus is coming.
— Oh， no. We mustn’t cross the street ________ the traffic light is green.
| A．after | B．while | C．since | D．until |
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