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

A.thisB.thatC.itD.one

C

解析試題分析:it?梢杂米餍问劫e語或者形式主語,當(dāng)think后面的賓語從句內(nèi)容較長時,常常用it代替后面從句內(nèi)容,做形式賓語,其它選項沒有這個功能,故選C。
考點:it做形式賓語
點評:it有兩種用法,一種是做形式主語,另一種就是形式賓語。在這里it 做了think的賓語,賓語后面be動詞可以省略。

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