问题
选择题
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
B.
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。