Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population.
A. What we know
B. are
C. spreading
D. among
What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population.
A. What we know
B. are
C. spreading
D. among
Kiến thức: Hòa hợp giữa chủ ngữ và động từ
Giải thích: chủ ngữ chính là "What we know about certain diseases"
Sửa: areis
Giải thích: chủ ngữ chính là "What we know about certain diseases"
Sửa: areis
Đáp án B.