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

分析 我認(rèn)為我們有必要做一些對環(huán)保有利的事情．

解答 答案：C；
根據(jù)語境推斷句意是"我認(rèn)為我們有必要做一些對環(huán)保有利的事情．"，結(jié)合設(shè)空處前面的I think和后面的necessary for us to do something 判斷此處的代詞在句子中作形式賓語，所以用代詞it，故選C

點(diǎn)評 本題考查代詞it作形式主語或賓語的用法．當(dāng)it作形式賓語，其句型結(jié)構(gòu)是主語+謂語+it+形容詞+動詞不定式；當(dāng)it作形式主語，其句型結(jié)構(gòu)是It is+形容詞+（for sb．）+to do sth．．需記住這兩個常用的句型結(jié)構(gòu)．

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