Answer:
Anaphora (repetition)
Step-by-step explanation:
The rhetorical strategy that Martin Luther King Jnr. uses when he restates "We can never be satisfied..." is Anaphora (repetition).
From the "I Have A Dream" speech, King repeated the "We can never be satisfied..." He kept repeating this as a way to buttress his point on the real issues confronting Negroes in the land. King uses such repetition to emphasize and reinforce the problems that blacks were facing.
Anaphora is known as a rhetorical device which uses repetition of a word or phrase at the commencement of successive sentences. This helps to convey and reinforce what the speaker is saying.