Average national IQ of Japan is 105, so it's not like it's not like it's unlikely.
I know many Japanese nationals, some with phd's and have been in the country more than 15 years and their engrish isn't that good.
Also, 105 is the reported national average.
most don't feel the need to know English in the first place because of national pride, but those that do out of pure necessity are actually pretty good at it.
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