I think necessary for us the birds．( )A．it, protectB．its, to protectC．it's, protectingD．it, to protect 题目和参考答案——青夏教育精英家教网—

20．I think ______ necessary for us _______ the birds．（　　）

	A．	it； protect		B．	its； to protect
	C．	it's； protecting		D．	it； to protect

分析我认为保护鸟类对我们来说是必要的．

解答答案：D；
根据语境推断句意是"我认为保护鸟类对我们来说是必要的．"，结合设空处前面的判断此处的代词在句子中作形式宾语，常用固定句型：think/find/make+it+形容词+（for sb．）+to do sth．，在句中使用it代替to do不定式形式宾语．故选D

点评本题考查代词it作形式主语或宾语的用法．当it作形式宾语，其句型结构是主语+谓语+it+形容词+动词不定式；当it作形式主语，其句型结构是It is+形容词+（for sb．）+to do sth．．需记住这两个常用的句型结构．

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