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luyenvantinh
2 năm trước
thầy giáo giơ cao một tờ giấy trắng, trên đo có một vệt đen dài và đặt câu hỏi với học sinh -các em có thấy gì không ? cả phòng vang lên câu trả lời -đó là một vệt đen cho biết cách trích dẫn của câu (đó là một vệt đen)
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