Answer :

Final answer:

The correct answer is 'couldn't.' It is the past tense of 'can't' and means 'to be unable to do something.'

Explanation:

The correct answer is couldn't.

Couldn't is the past tense of the modal verb 'can't,' which means 'to be unable to do something.'

For example, in the sentence 'Unfortunately, I couldn't complete the task,' it indicates that the person was unable to finish the task for some reason.

Learn more about Modal verbs here:

https://brainly.com/question/35902318

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