The chairman requested that .11/20The chairman requested that.the members studied more carefully the problemthe members study the problem more carefullywith more carefulness the problem could be studiedthe problem was more carefulnessly studiedGiải thíchĐáp án đúng: B Dịch: Chủ tịch yêu cầu rằng các thành viên nghiên cứu vấn đề cẩn thận hơn.