题目内容

【题目】I found my computer functioning much better， a new operating system.

A. to install B. installing

C. having installed D. installed

【答案】C

【解析】考查现在分词。句意：在安装了一个新的操作系统之后，我发现我的电脑运行得更好了．本句中划线前只有一个逗号，所有可推断考查现在分词作状语的用法，排除A和D．再结合本句的意思可知，安装新的操作系统应该是在电脑运行更快之前，所有应该使用现在分词的完成式作原因状语，排除B；故选C．

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