. . . . . . . . off the light, I went to bed.

A. Switched

B. Before

C. Switching

D. Having switched

Answer: Option D

Solution(By Examveda Team)

A perfect participle phrase indicates an action that occurred in the past. It is used to modify the main verb in the main clause.
Examples: Having being fired from the job, she started looking for a new job.
Having paid banned in most cities, the movie did not do well.