Question

21 The concert ....... before I arrived. 1)had started2)started3)starts​

Answer 1

The concert started​ before I arrived.

Answer 2

The correct answer is "had started."

In this sentence, we are referring to an event that happened before a specific point in the past (before "I arrived"). The use of the past perfect tense is appropriate here to indicate that the concert started before that point. Therefore, the correct form of the verb "start" is "had started."