4.We all regard ___ our duty to help those who are too poor to go to school. 得分：5分 A.this B.it C.that D.which

4.We all regard ___ our duty to help those who are too poor to go to school.
得分：5分
A.this
B.it
C.that
D.which

出自：河北建筑工程学院-大学英语2

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