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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学年初中英语九年级上册Module 2 Unit 4 Problems and advice第1课时 Reading（1）
—No, but we may ask our teacher.
—No. But my flight to Beijing was because of it.
—The machine made a terrible _____ so we couldn't _____ each other.
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