Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.
Trả lời câu hỏi dưới đây:
(A) Schools are (B) important and vital means (C) by which modern education (D) is provided.
Đáp án là B. Bỏ important hoặc vital vì hai từ nghia tuong duong nhau