Mr. sen is considered a great authority.....grammar can in be the answer
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Mr. Sen is considered a great authority of grammar.
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Answer:
on
Explanation:
Generally, when someone is an authority, the meaning is that they are an expert, and the preposition "on" is best. The abstract noun "authority", as a thing that you can have, uses the preposition "over." In that case, as you observed, "authority" carries the sense of control or responsibility, rather than knowledge.
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