Identify the option that correctly completes the following complex sentence with the most precise sequence of advanced verb tenses:"By the time the international summit concludes next week, delegates negotiations for over a fortnight, and it is estimated that they more than twenty bilateral trade pacts before the final communiqué is officially drafted."

Detailed Explanation

The correct option is (a). In this sentence, the first blank requires the future perfect continuous tense ('will have been continuing') because it emphasizes an ongoing action (negotiations) continuing over a period of time up to a specific point in the future ('By the time the international summit concludes next week'). The second blank requires the future perfect tense ('will have signed') to denote an action that will be completed before that same future reference point. To learn more about complex time relationships and verb forms, consult the detailed discussion on Wikipedia Reference.

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