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问答题
What occurs once in every month, twice in every moment, but not once in a thousand years?
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参考解析
解析：
单词month中有一个字母m，单词moment中有两个字母m，但在a thousand years中一个字母m都没有。
单词month中有一个字母m，单词moment中有两个字母m，但在a thousand years中一个字母m都没有。
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