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I think ____necessary for us _____the birds.

A. it , protect B. its, to protect

C. it’s , protecting D. it , to protect

D

【解析】

试题分析:句意:我认为保护小鸟对我们来说是必要的。根据句意及固定句型:think、find、make +it +形容词+to do sth,在句中使用it代替to do不定式做think的宾语。故选D。

考点:考查代词及动词不定式。

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