—— Hurry up. The bus is coming!
—— Oh, no, we mustn’t cross the street ______ the traffic lights are green.
| A．after | B．since | C．when | D．until |
—— Hurry up. The bus is coming!
—— Oh, no, we mustn’t cross the street ______ the traffic lights are green.
| A．after | B．since | C．when | D．until |
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