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【题目】A set of keys ____ in the library. Are they yours?

A. is B. am C. are D.aren’t

【答案】A

【解析】

试题分析:句意:一套钥匙在图书馆。他们是你的吗?A set of keys一套钥匙,用作主语时,谓语动词用第三人称单数形式,所以选A。

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