Question

identify the preposition" the books are kept in the shelf​

Answer 1

Answer:

in is the preposition in this sentence

Explanation:

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Answer 2

Answer:

For a standard shelf, I would go with - I placed the book on the shelf. If it is a deep, multi level bookshelf or enclosed with a glass or other type of door, 'in the shelf' would also be correct. For example, “I placed that book in the third bookshelf (or book case) on the second level