Final answer:
Damage to both Broca's area and the supplementary speech zone as a result of a stroke would typically lead to aphasia, with particular difficulty in producing speech (expressive aphasia).
Step-by-step explanation:
After a stroke affecting both Broca's area and the supplementary speech zone, the expected result would be aphasia and difficulties in speech production, not increased fluency, enhanced auditory perception, or improved speech comprehension. Aphasia can manifest in various ways, depending on which part of the brain is damaged. Damage to Broca's area often results in expressive aphasia, which is characterized by compromised speech production and non-fluent, halting speech. Thus, after a stroke in Broca's area and the supplementary speech zone, a person would likely experience significant challenges in forming coherent speech and grammar.