He felt       to work for human rights and progress.

A．it his duty

B．his duty

C．that is a duty

D．that is his duty

以下不含有实词活用现象的是（）

A.故谨医砭以救民

B.肇颁四方，景式万代

C.在昔未臻，惟帝时宪

D.丸艾而坏肝，投针而失胃

E.保我黎燕，介乎寿考