问题补充：
He felt duty to work for human rights and progress.
A. it his
B. his
C. that is a
D. it is his
答案：
(答案→)A. it his
B. his
C. that is a
D. it is his
解析：句意：他感觉为人权和进步而斗争是他的职责所在。这里是feel it +宾补+to do，it在这里是形式宾语，to work for human rights and progress.是真正的宾语，duty是宾补，that没有这种用法，故选A。
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