Final answer:
The sentence should be revised to include a comma after the introductory phrase
Step-by-step explanation:
The correct revision of the sentence is: Blushing, Caroline thanked him for the compliment and stammered that he also. The use of a comma after the word 'Blushing' is necessary to separate the introductory phrase from the main clause. This punctuation accurately conveys the intended meaning of the sentence.
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