The costs to maintain the base have proven to be too high, so our leader shut it down.
Should I use "has shut it down"? As for the context, let's just say it's a current event and the base has just been shut down.
They mean the same in this context. Pick the one you like.
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NecrophagistShould I use "has shut it down"?
I would. Both are OK, but why not continue with the same tense already used in the sentence when there is no obvious reason to change tenses?
CJ