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Paper       first invented in China .

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

B

解析試題分析:句意:紙是首先在中國發明的。結合常識,紙的發明是過去的事,故用一般過去時,故排除AB兩項。因為主語是paper不可數名詞,故謂語用單數形式,故選B。
考點:考查時態和主謂一致的用法。

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