A basic knowledge of social studies, such as history and geography, are considered a basic part32/64Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions. A basic (A) knowledge of social studies, such as history (B) and geography, are (C) considered a basic part of the education of every child. (D) basichistoryarechild.Giải thíchĐáp án : C “are” -> “is” vì chủ ngữ là “A basic knowledge” (số ít)