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

Câu hỏi :

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. from spreading

D. among

* Đáp án

B

* Hướng dẫn giải

are => is

Chủ ngữ của câu là “What we know …” (ngôi 3 số ít) nên tobe là “is”

Copyright © 2021 HOCTAP247