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题型：单选题 题类：常考题 难易度：普通
牛津版（深圳·广州）2018-2019学年初中英语八年级下册Module 1 Unit 1第2课时Reading (2)
—Wait a minute. Don't cross the street _______ the traffic lights are green.
—Yes. It can bring me much peace.
—I'm afraid I have no idea.
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