Traffic mustn’t cross the roads when the traffic lights are red. Walkers mustn’t do it, too. A——青夏教育精英家教网—

摘要： Traffic mustn’t cross the roads when the traffic lights are red. Walkers mustn’t do it, too. A B C D ( )

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(改错) Traffic mustn't cross the roads when the traffic lights are red. Walkers mustn't do it, too.

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