19 _____ for centuries that the world is round, but before that everyone thought it was flat.
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The answer to your question is:
" It has been believed for centuries that the world is round, but before that everyone thought it was flat."
In the question you asked, it is very clear that the statement represents past, thus It has been believed suits more keeping the grammatical rules in mind.
" It has been believed for centuries that the world is round, but before that everyone thought it was flat."
In the question you asked, it is very clear that the statement represents past, thus It has been believed suits more keeping the grammatical rules in mind.
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