[Grammar] before + present perfect

Iryn_

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Hello, dear forum users!

1) He worked as a shop assistant before he became a manager.
2) He worked as a shop assistant before he has become a manager.

Be so kind to say whether both of these sentences are correct, and if yes, how's the meaning different.
 

Tdol

Editor, UsingEnglish.com
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The first is fine. The second doesn't work for me.
 

Iryn_

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Nov 8, 2015
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Interested in Language
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Ukraine
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Could you explain why?
for example, if he's still a manager, there's connection to now, can't we use present perfect?
 
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