Who is knocking ____ the door
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Who is knocking at the door?
What is a preposition?
- In English Grammar, prepositions can be described as words which are added before a noun or noun phrase in a sentence.
- Preposition add meaning to a sentence.
- We can use the preposition 'at' when referring to a place, time or for some activities.
- As knocking the door is an activity, hence 'at' will be used.
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