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

A. is B. am C. are D.aren’t

【答案】A

【解析】

試題分析:句意:一套鑰匙在圖書館。他們是你的嗎?A set of keys一套鑰匙,用作主語時,謂語動詞用第三人稱單數(shù)形式,所以選A。

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