I haven't had lunch with my mother ____ a year ago.
- During
- Since
- For
- None of these
Explanation
The sentence should be: "I haven't had lunch with my mother since a year ago."
Since is used with a specific point in time (e.g., "since Monday," "since 2020," "since a year ago") to indicate when an action started that is still true or relevant to the present.
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