问题
选择题
He felt _______ to remind the public to protect the environment.
A．his duty
B．that is his duty
C．it his duty
D．it is his duty
答案
答案：C
此题考查it作形式宾语，真正的宾语是后面的不定式，作形式宾语的结构为 feel/ make/find等等 + it + 名词或形容词+ to do /that 从句，句意：他感到提醒公众保护环境是他的职责。所以选C。