题目内容
It is very important _______
| A．for working hard | B．to working hard |
| C．for work hard | D．to work hard |
D
解析试题分析：句意：努力学习是非常重要的。It is important to do sth.做某事是重要的。to do sth.是真正的主语，it是形式主语。故此处用动词不定式to work hard，故选D。
考点：考查非谓语动词的用法。
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