[ Vocabulary and Grammar ]
Identify the verb tenses in each sentence (past, present, future). Select the sentence with the correct shift in verb tense.
By the time the final speech began, many people have left the auditorium.
A. By the time the speech began, many people will have left the auditorium.
B. By the time the speech began, many people had left the auditorium.
C. Correct as is.

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