Question

Having ____ his driving test a dozen times , my brother finally passed​

Answer 1

Answer:

Having failed his driving test a dozen times , my brother finally passed​.

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Explanation:

Answer 2

Having Failed his driving test a dozen times, my brother finally passed.​

EXPLANATION:  

• It is clear from the information given in the question that the speaker's brother has earlier given a driving test before for a dozen times but was not able to pass it and he had only passed it recently.
• Therefore, it is  clear that a verb must be placed in the blank. But, we have to take care what form of verb to be used in the blank.
• Since, the action had taken place long time back therefore past form of the verb fail would be used  that's why failed would be appropriate for the blank.
• So, the final sentence would be: Having failed his driving test a dozen times, my brother finally passed.