Credit cards: can merchants charge in USD?

#3
Credit card statements here don't state Argentine Pesos. Can merchants charge in USD?
The can charge in us dollars if the purchase is in this currency . I have a argentinian credit card and overseas payments are in us dollars .
 
#4
If they can charge in USD then it would state USD, right? If there is no indication of what currency I assume it has to be interpreted as pesos.
 
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