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The Mongols and Chinese both tried to conquer Vietnam at various points ( of / in / from ) second millennium.

Which one is correct?

closed as off-topic by user3169, Davo, ColleenV Jan 10 at 16:44

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  • 1
    Were all those "points" between 1001 and 2000? If so, you should use "during the second millennium". – user3169 Jan 10 at 1:55

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