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8.Today's technique of paper production is due to Cai Lun,who _____ tree barks,old fishing nets and rags as raw materials.(  )
A.has usedB.was usingC.had usedD.used

分析 今天的造紙技術(shù)是因為蔡倫發(fā)明的,他使用樹皮、舊的漁網(wǎng)、以及破布作為原材料.

解答 答案:D
根據(jù)句意可知,who _____ tree barks,old fishing…是非限制定語從句修飾先行詞 Cai Lun,句子缺少謂語動詞,而蔡倫造紙使用樹皮、舊的漁網(wǎng)、以及破布作為原材料是發(fā)生在過去的事情,故只能用一般過去時.

點評 考生在答題時要根據(jù)具體語境做出選擇.

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