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

 

B

【解析】考查動詞時(shí)態(tài)。根據(jù)語境：我們充滿信心…。證明此事還未發(fā)生，故使用一般將來時(shí)態(tài)，答案選B。

 

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