题文
—Hey，man．You can’t cross the street now．You have to wait________the traffic lights turn green．
—Oh，sorry and thank you．
| A．when |
| B．after |
| C．until |
| D．while |
—Hey，man．You can’t cross the street now．You have to wait________the traffic lights turn green．
—Oh，sorry and thank you．
| A．when |
| B．after |
| C．until |
| D．while |
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