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____ the machine, the engineers paid much attention to the noise from it.
A.Having examinedB.Being examinedC.ExaminingD.Examined
C

试题分析:考查分词做状语。分词做状语的时候,当动词与句子主语构成主动关系,使用现在分词;当二者构成被动关系,使用过去分词。本题的exam与句子主语the engineers构成主动关系,故使用现在分词的形式,因为检查机器和注意到噪音几乎是同时发生的,使用现在分词的一般式即可。句意:在检查机器的时候,那些工程师们注意到里面传来的噪音。故C正确。A项表示动作发生在谓语动作之前。
点评:分词做状语的时候,当动词与句子主语构成主动关系,使用现在分词;当二者构成被动关系,使用过去分词。同时也要注意分词和主语的先后关系。
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