题目内容

【题目】Paper________ by Cai Lun in China about 2000 years ago.

A. can be invented B. is invented

C. will be invented D. was invented

【答案】D

【解析】

句意:2000年前蔡伦发明了纸。根据 about 2000 years ago可知是过去时态;故选D.

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