题目内容

We are confident that the environment________by our further efforts to reduce pollution.                                                                (2013·辽宁，30)
A．had been improvedB．will be improved
C．is improvedD．was improved
B

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。
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