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With his attention ________on the job,he didn't even look up when we came in.

A.to concentrate B. concentrating

C.concentrated D. having concentrated

C

【解析】

试题分析:句意:他把注意力都集中在工作上,当我们进来时都没有抬头。A .to concentrate不定式表示将来目的 B. concentrating 现在分词表示主动正在 C.concentrated 过去分词表示被动完成D. having concentrated现在分词的完成时态,concentrate one’s attention on “注意力集中,专注”, attention和concentrate是被动关系,故选C。

考点:考查非谓语动词的用法。

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