If you really hold on to your dreams, they _______ true one day.[ ]A. cameB. comes C. has comeD. wil

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• 关于单细胞生物的说法正确的是生物（）。A．能独立完成各种生命活动B．都属于动物类群C．都在一定程度上净化污水D．都必须生活在水中-七年级生物
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