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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）2019-2020学年初中英语七年级上册 Unit 6 Travelling around Asia 第6课时 Integration
—No, I was afraid to talk back. They looked really serious and scary.
—Yes, when we cross the street we must wait ________ the traffic lights turn green.
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