Final answer:
The correct past tense form of the verb 'tread' is 'trod.'
Explanation:
The correct use of the past tense form in this case is:
- She had trod for miles across the sand.
In this sentence, 'trod' is the correct past tense form of the verb 'tread.' The past tense of 'tread' is formed as 'trod' in this context.
Learn more about Verb conjugation in English here:
https://brainly.com/question/176789
