What appears once in a second, once in a month, once in a century, yet not at al

游客2024-08-05  10

问题 What appears once in a second, once in a month, once in a century, yet not at all in a year or a week?

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答案 The letter“n”.

解析 题干问什么在second里面出现1次,在month里出现1次,在century里面出现1次,但是在year和week里面1次都没有出现?根据观察,字母n符合这一现象,所以答案为字母n。
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