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Select the option that expresses the given sentence in active voice.
A number of patients will have been examined by 12 o'clock by the doctor.

  • A.The doctor will examine a number of patients by 12 o'clock.
  • B.The doctor will have examined a number of patients by 12 o'clock.
  • C.The doctor examined a number of patients by 12 o'clock.
  • D.The doctor has examined a number of patients by 12 o'clock.

Answer: B

The active form is 'The doctor will have examined a number of patients by 12 o'clock'. The passive 'will have been examined' is the future perfect passive, and the active voice of it is 'will have examined', with the doctor as the subject. Option A uses the simple future, option C the simple past and option D the present perfect, so each changes the tense of the original. The active form keeps the tense 'will have examined' and puts the doctor at the front, while the number of patients becomes the object. The other options change the tense to the plain future, simple past or present perfect and so alter the time of the action.

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