Question

Fill in the blank with a modal denoting past possibility.

I _____ smoke but I gave it up last year.

• A. must
• B. need to
• C. ought to
• D. used to

Answer 1

The correct option is D used to

Option D is the right answer because the statement is made in the past tense, and used to is the only correct option.

'Used to' is used when we refer to things in the past which are no longer true, as in this case, smoking.

Option A,B and C are incorrect because 'must', 'ought to' and 'need to' are used when something is required to be done no matter what, which does not make sense here because the statement is in past tense.