求讲解.The first part of the 20th century saw more great inventions.二十世纪的第一部分可以看到更多伟大发明?主语是什么啊?

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• 求讲解.The first part of the 20th century saw more great inventions.二十世纪的第一部分可以看到更多伟大发明?主语是什么啊?
• the chinese _______ the first to use paper money in the early part of the eleventh century.A.is B.are C.was D.wereB和D里应该选择哪个,
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