It was very important for us ________ ha...

It was very important for us ________ happy every day.

A．to stay

B．stay

C．stayed

D．staying

A 【解析】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。考点：考查固定句型

考点分析：

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