26, 23
34, 20
23, 33
27, 28 E. 23, 28
Answer is Right!
Answer is Wrong!
The correct answer is $\boxed{\text{E}}$, 23, 28.
The sequence is a simple alternating repetition of two subsequences:
- 17, 34
- 20, 31
The first number in each subsequence is repeated, and the second number is increased by 7.
Therefore, the next pair of numbers is 23, 28.