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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.
The amounts of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably.
- A. vary
- B. almost always
- C. The amount of
- D. stable
trả lời câu hỏi trước khi xem đáp án bên dướiQUẢNG CÁOCâu 1 Đáp án đúng: A
Đáp án A
Vary => varies vì chủ ngữ the amount of water vapor (lượng hơi nước) là chủ ngữ số ít.
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