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With the help of high technology, many new substances in the past years. A. disc

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With the help of high technology, many new substances in the past years. A. disc

With the help of high technology, many new substances（物质）______in the past years.

A. discovered    B. have discovered   C. had been discovered  D. have been discovered

试题答案

D

解析:

略

标签：technologyhighnewmanythe

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