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Who did this ?

  • A.By whom this was done.
  • B.By whom was this done.
  • C.By whom was this done ?
  • D.This was done by who ?

Answer: C

The passive is By whom was this done ?

'Who did this?' asks about the doer. In the passive, the object 'this' becomes the subject, the verb becomes 'was done', and 'who' becomes 'by whom'. Because it is still a question, the auxiliary 'was' comes before the subject, and the sentence ends with a question mark.

Option B has the right words but ends with a full stop, and option A also uses statement order ('this was done'). Option D uses 'by who', where the object form 'whom' is needed after a preposition, and puts the question word at the end.

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