We are confident that the environment by our further efforts to reduce production.A.had improvedB.is

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【题目】We are confident that the environment ________ by our further efforts to reduce production.

A.had improvedB.is improvedC.will be improvedD.improved

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【答案】C

【解析】

考查时态和语态。句意：我们相信，通过进一步努力减少生产，环境会得到改善。根据语境可知，此事还未发生，且此处表示被动，故用一般将来时的被动语态。故选C。