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The sentence that contains an infinitive is "Marina asked her parents to help her get a job as a babysitter".
What is infinitive?
"An infinitive is the basic form of a verb, having no tense and not being conjugated."
The sentence contains main verb form that is "to help" which does not contain any tense such as "helps", "helping" or "helped" and is not united with any other compound.
Thus, the sentence that contains an infinitive.
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