Q. I have not heard from him . . . . . . . . last week.
✅ Correct Answer: (A)
since
Explanation: The preposition since is used to indicate a starting point, after which the action continues. For example: I haven't seen them since 2012.
Explanation by: Team MCQ Buddy
The preposition since is used to indicate a starting point, after which the action continues. For example: I haven't seen them since 2012.