The train ______ by the time we reached the station.

Answer and explanation

Correct answer: C. had already left

  1. Step 1: The leaving happened before another past event (we reached), so the past perfect is needed.
Answer
had already left.
Why not the others: already left, has already left and was already leaving don't fit.

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The train by the time… | College English Test Band 4 (CET-4) - China