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
Giải bởi qa.haylamdo.com
Đáp án B thành “is”
Giải thích: Chủ ngữ của câu là “What we know …” (ngôi 3 số ít) nên tobe là “is”
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