This pair of socks ______ worn out.I'll have to buy a new ______.A.is,one B.are,ones C.is,pair D.are,pairs求教!为啥选C不是A呢?

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Thispairofsocks______wornout.I''llhavetobuyanew______.A.is,oneB.are,onesC.is,pairD.are,pairs求教!为啥选C不是

This pair of socks ______ worn out.I'll have to buy a new ______.A.is,one B.are,ones C.is,pair D.are,pairs求教!为啥选C不是A呢?
This pair of socks ______ worn out.I'll have to buy a new ______.
A.is,one B.are,ones C.is,pair D.are,pairs
求教!为啥选C不是A呢?

This pair of socks ______ worn out.I'll have to buy a new ______.A.is,one B.are,ones C.is,pair D.are,pairs求教!为啥选C不是A呢?
C
不可用one 代替有两个相同组件组合而成某样东西,如:裤子,袜子,鞋子,眼镜等,此时一般用pair