Of a positive three-digits number, the tens digit is three times the units digit, and the hundreds digit is twice the tens digit. Which of the following must be true?
I. n是奇数
II. n的个位数，十位数，百位数相加为偶数
III. n除以3余1
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AI only
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BII only
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CI and II
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DI,II,and III
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Enone
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正确答案: D