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The three-digit integer kss is the sum of the two-digit integers ks and rs, where k, r, and s are the digits of the integers. Which of the following must be true?

I. k = 2

II. r = 9

III. s = 5
  • AI only
  • BII only
  • CIII only
  • DI and II
  • EII and III
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正确答案: B

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