It is necessary _____ something to protect our environment.

A. do        B. to do        C. does      D. doing

 

【答案】

B

【解析】

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,“表示做某事對某人來說很adj”在這個結(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：It is +adj+for sb to do   adj應(yīng)該是對做這件事的評價，該題常�？疾椴欢ㄊ�，很多同容易出錯，同時還要加以區(qū)分It is+adj+of sb to do sth  adj應(yīng)該是對這個人做這件事的評價，adj多用形容人的

 

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