Question

I met him _the afternoon in ,at ,on
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Answer 1

Answer:-

in

I met him in afternoon.

$\rule{200}{1}$

•Noun(in)↓

→in can be categorized as a noun if used legalized.

$\rule{200}{1}$

•Preposition(in)↓

→Used before a noun.

eg:-'like','of' etc.

$\rule{200}{8}$

Answer 2

Answer:

I meet him at the afternoon