题目内容

20．We think                 a duty for everyone to protect the endangered animals．（　　）
A．ourselvesB．thisC．thatD．it

分析 考查it用法，句意：我们认为保护濒危动物是我们大家的职责．

解答 答案it，ourselves反身代词"我们自己"，this指代下文或近处的东西，that指代上文提到的物或远处的东西，it在此处作形式宾语，代替后面的for everyone to protect the endangered animalszhen真正宾语．选D

点评 it用法：一、指无生命、动物、植物和在性别不计或不详时指人和婴儿．
二、指心目中的人或上文中提到的人或事物，这那它   
三、可以代替指示代词this和that
四、作无人称代词的主语，表时间、天气、距离、温度、环境和情况．
五、表含糊概念，无补语，指从句叙述内容．
六----强调句中使用"It is/was+强调部分 （主语，宾语等）+that/who+其余部分"．
七、作形式主语或宾语

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27．A．when　B．before　C．though 　D．where
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29．A．came 　B．rushed 　C．looked 　D．stayed
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