A. My grandfather, B. is not only, C. a fastly runner, D. but also a great swimmer.
A.is not only
B.but also a great swimmer
C.My grandfather
D.a fastly runner✓ Correct
Explanation
'Fastly' is not a standard English word. The correct form is 'fast', which itself functions as an adverb, so 'a fastly runner' should be 'a fast runner'.
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