Question

This is the second time I ________ (do) this. (use a proper tense)

Answer 1

Answer:

Have done

This is the second time I have done this.

Answer 2

Question :

Use a proper Tense :

This is the second time I ________ (do) this.

Answer :

This is the second time I did this.

OR

This is the second time I have done this.

$I hope it helps you ☺️✌$