Luck has ( )new trousers.They are blue.A.a B.the C.a pair of

Luck has ( )new trousers.They are blue.A.a B.the C.a pair of
回答是用复数形式回答的,我有点糊涂了.

选C
a pair of 意为“一双”“一副”
a pair of+裤子（trousers/pants/shorts)
a pair of scissors 剪刀
a pair of shoes 鞋子
a pair of socks 袜子
等

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