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Paper       first invented in China .

A.is B.are C.was D.were

B

解析试题分析:句意:纸是首先在中国发明的。结合常识,纸的发明是过去的事,故用一般过去时,故排除AB两项。因为主语是paper不可数名词,故谓语用单数形式,故选B。
考点:考查时态和主谓一致的用法。

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