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高一英语第二十一单元－教学教案,
9.In the 1870s, when Mark was already in his fifties, he found it important to study the situation in Russia. 在19世纪70年代，马克思已经50多岁了，他觉得研究俄国的形势很重要。
in one’s fifties指在某人50多岁时（50──59）。例如：
He became famous is his twenties. 他20多岁时就出名了。
When he was in his thirties, he went to the countryside and became a farmer.
当他30多岁的时候，他去了农村，当了一个农民。
The professor was an ordinary—looking little man is his sixties.
那位教授是一位60多岁，个子矮小，相貌平常的人。
2)句中的it是形式宾语，真正的宾语是后边的动词不定式。此句型结构是“主语＋谓
语动词＋it＋宾补（形容词或名词）＋动词不定短语。常用于此种结构的谓语动词还有think、fell、make、consider等。例如：
I think it necessary to go there. 我认为到那儿去一趟很有必要。
We find it impossible to finish the work in ten minutes.
我们认为10分钟内完成那项工作是不可能的。
He feels it his duty to help those who are in trouble.
他感到帮助那些处于困境中的人们是他的责任
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