【题目】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】考查时态。我们有信心，通过我们的进一步努力，减少环境污染会有所所改善。根据“我们相信”说明时间将来发生，主语为the environment,所以用将来被动。故选A。