Did you walk such a long way on such a hot day? You _______ be tired and thirsty. [ ]A. can B. must

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• —Look! A book is on the floor. Whose is it?—It ______ be Rick’s. It has his name on it.A．mustn’tB．ca
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• 在农田生态系统中，生产者是（）A．农民B．农作物C．耕地D．耕牛-七年级生物
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