He kept plugging away in his cubicle, it seemed he was the only person not called into the what?\nOptions:\n- building\n- conference\n- assessment\n- demonstration\n- garage
Let's think carefully first. Step-by-step reasoning process:
User
To keep plugging away means to continue working steadily in one place. Conferences and meetings are usually held at work. When one is not called into a conference, they keep working in his cubicle. So the final answer is conference.
Assistant