What we know about certain diseases are still not sufficient to prevent them from spreading

45/50

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 (A) certain diseases are (B) still not sufficient to prevent them from spreading (C) easily among (D) the population.

what we know about

are

from spreading

among

Giải thích

Đáp án B.

are → is

Câu này sai về sự hòa hợp giữa chủ ngữ và động từ. Mệnh đề đứng đầu câu làm chủ ngữ, động từ chia số ít.