We are confident that the environmentby our further efforts to reduce pollution. (·辽宁

问题补充：

We are confident that the environmentby our further efforts to reduce pollution. (·辽宁，30)

A. had been improved

B. will be improved

C. is improved

D. was improved

答案：

A. had been improved

(答案→)B. will be improved

C. is improved

D. was improved

解析：

考查时态。根据we are confident和by our further efforts可知，环境得到改善应该是将来的事情，故用一般将来时的被动语态。