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?yàn)椴虃惏l(fā)明的，他使用樹(shù)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(yǔ)從句修飾先行詞 Cai Lun，句子缺少謂語(yǔ)動(dòng)詞，而蔡倫造紙使用樹(shù)皮、舊的漁網(wǎng)、以及破布作為原材料是發(fā)生在過(guò)去的事情，故只能用一般過(guò)去時(shí)．

點(diǎn)評(píng) 考生在答題時(shí)要根據(jù)具體語(yǔ)境做出選擇．

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