Among the countries that officially use the English language, what country has the highest capital?
officially use the English language refers to `Language` = 'English' AND IsOfficial = 'T'; highest capital refers to MAX(Capital);
SELECT T1.Code FROM Country AS T1 INNER JOIN CountryLanguage AS T2 ON T1.Code = T2.CountryCode WHERE T2.Language = 'English' AND T2.IsOfficial = 'T' ORDER BY T1.Capital DESC LIMIT 1