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:我們認為保護瀕危動物是我們大家的職責(zé).

解答 答案it,ourselves反身代詞"我們自己",this指代下文或近處的東西,that指代上文提到的物或遠處的東西,it在此處作形式賓語,代替后面的for everyone to protect the endangered animalszhen真正賓語.選D

點評 it用法:一、指無生命、動物、植物和在性別不計或不詳時指人和嬰兒.
二、指心目中的人或上文中提到的人或事物,這那它   
三、可以代替指示代詞this和that
四、作無人稱代詞的主語,表時間、天氣、距離、溫度、環(huán)境和情況.
五、表含糊概念,無補語,指從句敘述內(nèi)容.
六----強調(diào)句中使用"It is/was+強調(diào)部分 (主語,賓語等)+that/who+其余部分".
七、作形式主語或賓語

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