Bộ 20 đề luyện thi Chuyên Anh năm 2023 có đáp án (Đề 96)

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

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

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Giải thích

Đáp án: B