a set of keys 后面be动词用啥 A set of keys ( )(be) on the floor

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a set of keys 后面be动词用啥 A set of keys ( )(be) on the floor
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a set of keys 后面be动词用啥 A set of keys ( )(be) on the floor
a set of keys 后面be动词用啥 A set of keys ( )(be) on the floor

a set of keys 后面be动词用啥 A set of keys ( )(be) on the floor
is
a set是单数

用is , a set 表示的是keys的集合,就像是一组东西一样,谓语动词应该用单数。