Choose the correct form: By the time we reached the station, the train ____.
- A. left
- B. has left
- C. had left
- D. was leaving
Explanation
When two past actions are compared, the earlier one takes the past perfect, so the train had already gone before we arrived. The present perfect cannot be used because the whole situation is in the past. The simple past would suggest both events happened at the same moment.
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