Direction: Sentences are given with blanks to be filled in with an appropriate and suitable word. Four alternatives are suggested for each question. Choose the correct alternative out of the four.
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It was very kind of you to do the washing-up, but you ____ it.
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- didn’t have to do
- hadn’t to do
- mightn’t have done
- mustn’t have done
- didn’t have to do
Correct Option: D
Here, mustn’t have done is the right usage.