【題目】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

【答案】B

【解析】試題分析：考查時態(tài)。根據(jù)“我們相信”說明時間將來發(fā)生，所以用將來被動。

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