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Option 3 : 3
The error lies in part 3.
If two actions take place in the past one after the other, then the 1st action will be in past perfect tense and the 2nd action will be in simple past tense. Here the two actions are:
Action 1: He reached the class
Action 2: He found that the teacher had already left (This happened before he reached in the class so it will be in Past Perfect Tense-Form).
The correct sentence is: By the time I reached the classroom, the teacher had already left.
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