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A child could not have done this mischief.

  • A.This mischief could not be done by a child.
  • B.This mischief could not been done by a child.
  • C.This mischief could not have been done by a child.
  • D.This mischief a child could not have been done.

Answer: C

Correct answer: This mischief could not have been done by a child.

The modal perfect could not have done becomes could not have been done - the perfect have is kept and been inserted before the participle. Dropping either leaves the tense wrong.

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