It is necessary _____ something to protect our environment.


  1. A.
    do
  2. B.
    to do
  3. C.
    does
  4. D.
    doing
B
試題分析:此題重點(diǎn)考查固定句型,It is+形容詞 for sb. to do sth,“表示做某事對(duì)某人來說很adj”在這個(gè)結(jié)構(gòu)中,it是形式主語,真正主語是后面的不定式短語,因此排除A、C、D故選B
考點(diǎn):固定句型,It is+形容詞 for sb. to do sth的用法
點(diǎn)評(píng):It is +adj+for sb to do   adj應(yīng)該是對(duì)做這件事的評(píng)價(jià),該題常�?疾椴欢ㄊ�,很多同容易出錯(cuò),同時(shí)還要加以區(qū)分It is+adj+of sb to do sth  adj應(yīng)該是對(duì)這個(gè)人做這件事的評(píng)價(jià),adj多用形容人的
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