Question

if the wrong word is used below, change it. if there is no error, click \submit answer.\ the affect of dr. hibberts training on his marathon time is incredible!

Explanation:

The sentence requires a noun to refer to the result of Dr. Hibbert's training. "Affect" is typically a verb; the correct noun form meaning a result or influence is "effect".

Answer:

The effect of Dr. Hibbert's training on his marathon time is incredible!