题目内容

15．I think_____necessary for us to do something to protect our environment．（　　）
A．thatB．thisC．itD．one

分析 我认为我们有必要做一些对环保有利的事情．

解答 答案：C；
根据语境推断句意是"我认为我们有必要做一些对环保有利的事情．"，结合设空处前面的I think和后面的necessary for us to do something 判断此处的代词在句子中作形式宾语，所以用代词it，故选C

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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60．What's the best title of the passage？C．
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