Long after everyone … the hall, Obi still sat inside?

Analyze the question

The sentence is: "Long after everyone ....... the hall, Obi still sat inside."

The main clause uses the simple past ("sat"). The gap describes an action that happened before that past moment, namely everyone leaving. We need the correct tense to show this sequence of events.

Explain the concept

When two past events are described, the earlier event uses the past perfect tense (had + past participle). The later event uses the simple past.

• Earlier action: everyone left → had left
• Later action: Obi still sat inside → sat

Solution

1. "Sat" tells us the story is in the past.
2. Everyone's departure happened before the moment Obi "still sat" there.
3. So the departure needs the past perfect: had left.

Checking the options:

• A. left: simple past. It is grammatically possible, but it doesn't show that the leaving came first. "Long after" strongly signals an earlier completed action, so the past perfect is the better choice.
• B. is leaving: present continuous, which clashes with the past tense.
• C. has left: present perfect, which doesn't fit a past narrative.
• D. had left: past perfect, which correctly shows the earlier action.

Answer: D. had left

Full sentence: "Long after everyone had left the hall, Obi still sat inside."

Exam tip

When you see a past-tense verb in one clause, ask: "Did the action in the gap happen earlier?" If so, use had + past participle. Words like after, before, by the time, and already often signal the past perfect.