题目内容
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 used | B. | was using | C. | had used | D. | used |
分析 今天的造纸技术是因为蔡伦发明的,他使用树皮、旧的渔网、以及破布作为原材料.
解答 答案:D
根据句意可知,who _____ tree barks,old fishing…是非限制定语从句修饰先行词 Cai Lun,句子缺少谓语动词,而蔡伦造纸使用树皮、旧的渔网、以及破布作为原材料是发生在过去的事情,故只能用一般过去时.
点评 考生在答题时要根据具体语境做出选择.

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