He felt _______ to remind the public to protect the environment.
A．his dutyB．that is his dutyC．it his dutyD．it is his duty
C
此題考查it作形式賓語，真正的賓語是后面的不定式，作形式賓語的結(jié)構(gòu)為 feel/ make/find等等 + it + 名詞或形容詞+ to do /that 從句，句意：他感到提醒公眾保護環(huán)境是他的職責(zé)。所以選C。
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