题目内容
6．A．When the traffic lights are red．B．When the traffic lights are green．
C．When the traffic lights are yellow．
分析 略
解答 略
点评 略
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B．When the traffic lights are green．
C．When the traffic lights are yellow．
题目内容
6．A．When the traffic lights are red．分析 略
解答 略
点评 略