In the following questions sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four.
Your father used to be the principal of this college,

Options

A. did he ?
B. does he ?
C. didn't he
D. doesn't he ?

Answer

C

Explanation

didn.t is the right Auxiliary to be used with used to.
Here, didn.t he ? is the right usage.