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Choose the most appropriate phrase from the options given below to complete the following sentence. The aircraft __________ take off as soon as its flight plan was filed. A. Is allowed to B. Will be allowed to C. Was allowed to D. Has been allowed to

GATE 2014 · General Aptitude · Tenses · easy

Answer: C. Was allowed to

  1. Identify the time reference from the subordinate clause: The subordinate clause 'as soon as its flight plan was filed' uses past simple passive 'was filed'. This fixes the time reference firmly in the past.
  2. Choose between past simple and present perfect: Option D 'Has been allowed to' is present perfect passive. While present perfect can refer to past events, 'as soon as' followed by simple past indicates a completed sequence in the past, not an event with present relevance. 'Was allowed to' (Option C) is the natural match for a completed past sequence introduced by 'as soon as'.
  3. Confirm the answer: 'The aircraft was allowed to take off as soon as its flight plan was filed.' — both clauses in past simple, consistent and natural.