If you're referring to the (extremely limited) built-in citation feature in Word, that's not something Zotero supports exporting to.
If you're trying to do something else (e.g., just generate a bibliography in a Word document), you'll need to say more about what you're trying to accomplish.
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If you're trying to do something else (e.g., just generate a bibliography in a Word document), you'll need to say more about what you're trying to accomplish.