The correct option to fill in the blank is had shared.
- Have shared is in the present perfect tense, which is used to talk about something that happened in the past but has a connection to the present. In this case, there is no connection between the fact that the speaker shared the home with her husband in 1986 and the fact that the home still smelled like him.
- Sharing is in the present progressive tense, which is used to talk about something that is happening now. In this case, the home no longer smells like the speaker's husband, so the present progressive tense is not appropriate.
- Shared is in the simple past tense, which is used to talk about something that happened in the past. However, the simple past tense would not be grammatically correct in this sentence because it would not indicate that the event happened before the other event.
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