. By providing such services as mortgages, home improvement loans, automobile loans, financial advice, and staying within the metropolitan areas, Acme Bank has become one of the most profitable savings banks in the nation.
正确选项<and staying and financial advice, and by staying>的斗号, 是否需要加? 按道理,by staying 和by providing是并列的,只是2者的并列, 应该不应该加斗号的