◎ 题干
It was very important for us  ________ happy every day.
A.to stayB.stay C.stayedD.staying
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It was very important for us ________ happy every day.A.to stayB.stay C.stayedD.staying…”主要考查了你对  【therebe句型】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。