1 

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

A. this       B. that      C. it  D. one

 

【答案】

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(xiàng)沒有這個功能，故選C。

考點(diǎn)：it做形式賓語

點(diǎn)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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