【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(shuō)明時(shí)間將來(lái)發(fā)生，所以用將來(lái)被動(dòng)。

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