The patent has been in controversy______(自从10年前首次被批准以来).

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问题 The patent has been in controversy______(自从10年前首次被批准以来).

选项

答案ever since they were first authorized ten years ago

解析 ①时间状语从句：“自从”ever since；②被动语态：空白处“他们”和“批准”为动宾关系。应译为英语的被动语态；③“批准”authorize。

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大学英语六级

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