In the past few years, a great many teachers have found       very important to teach their students how to learn.
A．this B．thatC．oneD．it
D

試題分析：考查形式賓語。在英語中只有it可以作為形式主語，形式賓語。在本句中It作為形式賓語，代替真正的賓語to teach their students how to learn.句意：在過去的幾年里，很多老師都發(fā)現(xiàn)教會學生如果學習很重要。故D正確。
點評：英語中能做形式主語和形式賓語的只有it。所以這個用法很集中，也很好掌握。
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