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The sentence which contains a split infinitive is option D. Swimmers must be sure to completely follow all of the team guidelines.
What is a split infinitive?
A split infinitive takes place when a word (often an adverb) or a phrase is placed between "to" and the verb that form the infinitive. That is what we have in option D. The adverb "completely" is placed between "to" and the verb "follow," splitting the infinitive.
Learn more about split infinitives here:
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