问题详情：
We think ________ is our duty to make our country a better place.
A．it B．this
C．that D．one
【回答】
解析：题干中________ is our duty to make our country a better place为省略了引导词that的宾语从句，it在从句中作形式主语，真正的主语为后置的不定式短语to make our country a better place。
*：A
知识点：代词
题型：选择题
