Question

Who has spoiled the painting? (Change voice)
1) By whom has the painting been spoiled?
2) The panting has been spoiled by whom?
whom?
3) By whom has the painting spoiled?
4) By whom had the painting been spoiled?
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Answer 1

Explanation:

4 is the right answer

by whom had the painting been spoiled

Answer 2

2.The panting has been spoiled by whom?

Hope this helped