We are confident that the environment by our further efforts to reduce pollution.
A. improves
B. will be improved
C. has improved
D. was improved
网友回答
A. improves
(答案→)B. will be improved
C. has improved
D. was improved
解析：句意：我们确信经过我们减少污染的进一步努力，环境会被改善的。根据are confident我们现在确信， by our further efforts通过进步的努力，那环境的改善应是在将来，又因 主语environment 与谓语improve之间是被动关系，故用一般将来时的被动式。故选B。