It is high time that we ____ the amount of carbon dioxide in our daily life.
A. reduce     B reduced    C will reduce   D reduces
B

試題分析：考查虛擬語(yǔ)氣。固定句式 It is high time that sb 過(guò)去時(shí)/should+動(dòng)詞原形；是某人做某事的時(shí)候了。Should不可以省略。句意：是時(shí)候減少二氧化碳排放量的時(shí)候了。故B正確。
點(diǎn)評(píng)：固定句式 It is high time that sb 過(guò)去時(shí)/should+動(dòng)詞原形；是某人做某事的時(shí)候了。Should不可以省略。
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