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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】

試題分析：句意：我認為保護小鳥對我們來說是必要的。根據句意及固定句型：think、find、make +it +形容詞+to do sth，在句中使用it代替to do不定式做think的賓語。故選D。

考點：考查代詞及動詞不定式。

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