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题型:单选题 题类:常考题 难易度:普通

仁爱科普版九年级上Unit 4 Amazing ScienceTopic 3 China is the thirdnation that sent a person into space.同步练习

The scientist don't exactly know when the universe         but they are still studying it.

A、come true B、come about C、came into being D、come out
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