<span>A) although
B) for example
C) in other words
D) on the contrary
</span><span>B) for example </span><span>
Have a nice day! :)</span>
The repetition in the first two lines is showing a rhyme. Usually, poems are supposed to rhyme, and certain words help the poem rhyme better. In conclusion, the answer is:
It adds rhyme to the poem.
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