Do you know any singers who ____ good at writing their own songs? [ ]A. is B. does C. are D. do -九年级

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• The light is on in Mr. Green’s room. He _______ be at home.A．mustB．canC．mustn’tD．can’t-九年级英语
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• There ______ a number of people in the airport. The number of people who travel by plane ______ larg
• 如图表示某生态系统组成示意图，以下说法正确的是（）A．从图中可以看出一个完整的生态系统包括生产者、消费者和分解者B．如果此生态系统受到了有毒物质DDT的污染，那么植物体内-生物
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