问题描述：
〓英语〓一道关于简单句与it的用法的选择题〓小诺求助〓
He felt _______ to work for human rights and progress.
A.it his duty
B.his duty
C.that is a duty
D.that it his duty
He felt _______ to work for human rights and progress.
A.it his duty
B.his duty
C.that is a duty
D.that it his duty
问题解答：
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