题目内容

10．First aid does really save lives when__________properly and timely．（　　）
A．performingB．to performC．performedD．perform

分析 如果恰当及时，急救确实能够救命．

解答 答案是C．本题考查"连词+分词"的结构．"连词+分词"的结构在句中往往做状语，属于分词做状语；分词做状语时分词的选择是看分词和句子主语之间的关系：分词和句子主语之间是主谓关系（主动关系），用现在分词；分词和句子主语之间是动宾关系（被动关系），用过去分词；本题中连词when后的perform 和句子主语first aid之间是被动关系，所以答案选择C．注意区别，"疑问词+to do"在句中起着名词作用，做主语、宾语或表语，而"连词+分词"在句中充当状语．

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现，然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断．

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