We didn’t expect ____________ you here.[ ]A. see B. to see C. seeing-九年级英语

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• 设计对照实验时，应遵循的原则是（）A．除实验变量外，其他变量都不同B．除实验变量外，其他变量都相同C．所有变量都不同D．所有变量都相同-八年级生物
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