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Hehastriedfourtimes,buthisteacherwantshimtotry--fifthtime为什么填答案是a而不是the

题目详情
He has tried four times,but his teacher wants him to try --fifth time
为什么填答案是a 而不是the
▼优质解答
答案和解析
他已经试了4次,他还想再试第五次.不是特指the , a + 序数词 = another