题目内容

18．_____ in the business world for three months，Dora got tired of it and decided to turn to teaching．（　　）
A．To workB．WorkingC．WorkedD．Having worked

分析 句意：已经在生意场上工作了三个月，Dora觉得厌倦了它，并决定转向教学．

解答 答案D．分析句子结构可知，逗号之后是主句，主语是"Dora"，逗号之前是非谓语动词形式，主语"Dora"与所给动词"work"构成逻辑上的主动关系，应该用现在分词从而排除A和C项．再根据"in the business world for three months"可知，"在生意场上工作"动作先于"决定转向教学"发生，应该用现在分词的完成式作状语，从而排除B项，因此D项符合语境，故选D．

点评 本题考查非谓语动词用法．做这类题目首先根据句意判断是谓语还是非谓语，如果是分词做状语的时候，看动词与逻辑主语构成主动关系，就使用现在分词的形式；如果二者构成被动关系就使用过去分词的形式．不定式表示动作未发生作目的状语．

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