My uncle . . . . . . . . go for a walk every morning.

A. must

B. should

C. would

D. used to

Answer: Option D

Solution(By Examveda Team)

We use 'used to' when we refer to things in the past which are no longer true. It can refer to repeated actions or to a state or situation.
Example: He used to play football for the local team, but he's too old now.