Q.753 : It was very kind of you to do the washing-up, but you ...............it.

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Q.753 : It was very kind of you to do the washing-up, but you ...............it.
(a) didn`t have to do
(b) hadn`t to do
(c) mightn`t have done
(d) mustn`t have done

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Answer :mustn`t have done