【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】考查時(shí)態(tài)。根據(jù)“我們相信”說明時(shí)間將來發(fā)生，所以用將來被動(dòng)。

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