问题
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
B:that is his duty
C:it his duty
D:it is his duty
正确答案是：
同类题型
Although he failed this time, he didn’t give up and ＿＿＿＿＿＿studying hard.
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