一个生态系统，无论大小都是由（）A．生产者，消费者，分解者组成B．植物，动物，细菌，真菌组成C．生物部分和非生物部分组成D．阳光，空气，水组成-生物

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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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