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问题: 一个很简单的填空题~谢谢!

Although i was positive that the girl had stolen my ring,i couldn't find any________.
proof or proofs? and why!

any后面到底怎么用啊?谢谢!

解答:

Although i was positive that the girl had stolen my ring,i couldn't find any___proof_____.

any后面接单数名词