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There is ( ) A.key B.a set of key C a set of keys D.keys 选哪个?为什么

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There is ( ) A.key B.a set of key C a set of keys D.keys 选哪个?为什么
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选C.
谓语动词的单复数根据set来定,前面的谓语动词是单数is,所以用 a set of(一串),一串钥匙肯定不止一片啊,所以后面用复数.
就像:There is a pair of shoes.
There are two pairs of shoes.