【題目】I think ____necessary for us _____the birds.

A. it , protect

B. its, to protect

C. it’s , protecting

D. it , to protect

【答案】D

【解析】句意：我認為對于我們來說保護鳥類是有必要的。此題考查固定句式sb thinks it +形容詞+for sb to do sth某人認為做某事怎么樣。根據(jù)句意，應選D。

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