The Passive voice of . "Who did that ?"
A'By whom was that done ?"
B"By whom is that done ?"
C"By whom that is done ?"
D"By whom is it done ?"
The Passive voice of . "Who did that ?"
A'By whom was that done ?"
B"By whom is that done ?"
C"By whom that is done ?"
D"By whom is it done ?"