It is high time that we the amount of carbon dioxide in our daily life.A. reduce B reduce

问题补充：

It is high time that we the amount of carbon dioxide in our daily life.

A. reduce B reduced C will reduce D reduces

答案：

解析：考查虚拟语气。固定句式 It is high time that sb 过去时/should+动词原形；是某人做某事的时候了。Should不可以省略。句意：是时候减少二氧化碳排放量的时候了。故B正确。