In the question below choose the word(s) or phrase(s) which best fills(s) the gap(s):
By the time the plane reaches Harare, it .... in the air for twelve hours.
This sentence expresses a future perfect tense — used to indicate that an action will be completed before a certain point in the future. The clue here is "By the time...", which signals that we're referring to something that will have happened before another future event. The future event: "the plane reaches Harare" The completed action before that point: "it would have been in the air for twelve hours"
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