As can be inferred from the passage, sociologists...
Câu hỏi: As can be inferred from the passage, sociologists can be frustrated when________.
A questionnaires are too difficult to read
B respondents are too eager to supplement questions with their own opinions
C respondents often do not complete and return questionnaires
D questionnaires are too expensive and difficult to distribute
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT Quốc Gia môn Tiếng Anh trường THPT Đào Duy Từ - Hà Nội - lần 8 năm 2016