【题目】We are confident that the environment ______ by our further efforts to reduce pollution.
A. had been improved B. will be improved
C. is improved D. was improved
在线课程【答案】B
【解析】试题分析：考查时态。根据“我们相信”说明时间将来发生，所以用将来被动。
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We are confident that the environment by our further efforts to reduce pollution.A. had been improve
编辑：chaxungu时间：2026-04-27 03:01:57分类：高中英语题库
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