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Câu hỏi: 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.
When is a flag hung upside down, it is an internationally recognized symbol of distress.
A. is a flag
B. upside
C. it is
D. internationally
When is a flag hung upside down, it is an internationally recognized symbol of distress.
A. is a flag
B. upside
C. it is
D. internationally
Phương án A được sửa lại là when there is a flag
Đáp án A.