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It was very important for us  ________ happy every day.
A.to stayB.stay C.stayedD.staying
A

试题分析:考查固定句型;it’s +adj+for sb to do,it是形式主语,不定式是真正的主语,句意:我们每天保持快乐很重要。选A。
点评:It做形式主语还可以代替that从句,It is+adj/n.+that从句,做题时要会分析句子成分。
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