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：考查虛擬語氣。固定句式 It is high time that sb 過去時/should+動詞原形；是某人做某事的時候了。Should不可以省略。句意：是時候減少二氧化碳排放量的時候了。故B正確。
點評：固定句式 It is high time that sb 過去時/should+動詞原形；是某人做某事的時候了。Should不可以省略。
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