Mark 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)
A. basic
B. history
C. are
D. child.
Đáp án : C
“are” -> “is” vì chủ ngữ là “A basic knowledge” (số ít)