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题型：单选题 题类：模拟题 难易度：普通
黑龙江省哈尔滨市香坊区2020年九年级英语第二次模拟考试卷
—Yes. At the end of 2020, garbage-sorting systems __________in 46 cities in our country.
—Oh? I'm not sure. But there ______ be something important happening.
powerful kangaroo replace lend against
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