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

試題分析：考查固定句型;it’s +adj+for sb to do，it是形式主語(yǔ)，不定式是真正的主語(yǔ)，句意：我們每天保持快樂(lè)很重要。選A。
點(diǎn)評(píng)：It做形式主語(yǔ)還可以代替that從句，It is+adj/n.+that從句，做題時(shí)要會(huì)分析句子成分。
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