【題目】Here ___a set of __________.
A.are; keys
B.is ; key
C.is keys

【答案】C
【解析】句意：這里有一套鑰匙。a set of keys一套（串）鑰匙，用作主語時謂語動詞和a set一致，用第三人稱單數(shù)形式。所以選C。

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