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I think _______ our duty to keep our environment clean and tidy.

A.thisB.thatC.itD.one

C

解析试题分析:it常可以用作形式宾语或者形式主语,当think后面的宾语从句内容较长时,常常用it代替后面从句内容,做形式宾语,其它选项没有这个功能,故选C。
考点:it做形式宾语
点评:it有两种用法,一种是做形式主语,另一种就是形式宾语。在这里it 做了think的宾语,宾语后面be动词可以省略。

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