Recently,astudywascarriedouttodeterminewhowasthegreates...
問題詳情：Recently,astudywascarriedouttodeterminewhowasthegreatestAmericanpresident．Sixty-fivepresidentialhistorianstookpartinit,andtheyjudgedthepastforty-twoAmericanleadersbasedontenleadershipqualities,...