Oxygen plays a important role in maintaining live.
A. a
B. plays
C. role
D. live
Giải bởi qa.haylamdo.com
Đáp án A thành “an”
Giải thích: Dùng “an” khi ngay sau nó là từ bắt đầu bằng các nguyên âm (u,e,o,a,i).
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