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

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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
There is ( ) A.key B.a set of key C a set of keys D.keys 选哪个
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.
再问： 可是前面是is 后面是 keys 为什么可以
再答： 看这个：There is a pair of shoes. 前面的is是根据set来定，而不是keys，就像这里的is是根据pair来定 我们可以说：There is a key. 有一片钥匙 There are two keys. 有两片钥匙 There is a set of keys. 有一串钥匙 There are two sets of keys. 有两串钥匙 不懂再追问》》》
There is ( ) A.key B.a set of key C a set of keys D.keys 选哪个 I have two __ .A.set of keys B.set of key C.sets of keys D.s 是a set of keys还是a set of key? A set of keys 是there is a set of keys还是there are a set of keys? a set of keys is on the sofa.(on the sofa部分提问）__a set of key a set of keys please. 求解(a set of keys) a set of keys is on a set of keys 为什么key加‘s’还有play computer games 也加‘s' 今天老师跟我们说a set of keys后面用is,后来我们读了一篇短文是这样的：Found:A set of key a set of ____(key).