问题补充:
We are confident that the environmenr by our further efforts to reduce pollution
A. had been improved
B. will be imroved
C. is improved
D. was improved
答案:
A. had been improved
B. will be imroved
C. is improved
D. was improved
解析:句意:我们相信我们进一步减少污染的努力将会改善环境状况。根据题干中主句是将来时,还有空后的further判断此处应用将来时。
【考点定位】考查时态和语态。