Directions :Sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four.
It was very kind of you to do the washing-up, but you _ it.
The correct answer is option number -D
Mustn't have done is the correct answer.
Mustn't have -Must is a modal verb,it adds meaning to another verb.
Mustn't we use to show possibility or necessity.
Must not -We use to talk about things we need to avoid doing or while telling someone to not do it.
Rest options are grammatically & contextual incorrect.
Hadn't to do -Had we use to indicate past things.Also hadn't to do is grammatically incorrect.
Might -We use might to show prediction, possibility, probability.
Ex- the Prime Minister might visit the town.
Here indicating possibility.
Might & hadn't is inappropriate because sentence is in the present tense.
Usage of didn't is not contextually correct.
Didn't have to do -We say didn't have to represent specific point of time that has already passed.
Only option `Mustn't have do' is grammatically & contextually correct.
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