Select the most appropriate option that can substitute the highlighted segment in the given sentence.
The train was already left before we reached the platform.

Correct option is C

The correct substitution of the highlighted words is (c) train had already left. Explanation: The sentence refers to two actions in the past: "the train leaving" and "we reaching the platform". The action of the train leaving occurred before the action of reaching the platform. Therefore, the past perfect tense should be used for the earlier action. Grammatical rule used: When two actions happen in the past, the earlier one uses Past Perfect Tense and the later one uses Simple Past Tense. Example: He had gone out before I reached home. Information Booster: Past perfect is used only when two past events are compared with timing.