is everyone’s duty the law.A. That; do obeyB. It; to obeyC. That; obeyingD. It; obeying

问题补充：

is everyone’s duty the law.

A. That; do obey

B. It; to obey

C. That; obeying

D. It; obeying

答案：

A. That; do obey

(答案→)B. It; to obey

C. That; obeying

D. It; obeying

解析：it 是形式主语, 真正的主语是to obey the law.