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A:_____? B:About two and a half months.

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A:_____? B:About two and a half months.
A When are you leaving for Shanghai?
B How long have you been at this school?
如果是B,时间段应该用FOR呀!!FOR TOW AND A HALF MONTHS!!
选B
How long…?[……多久?] 回答用“(For +)一段时间”,[注意,“for”可以省略.]而“About two and a half months.(大约两个半月)”表示“一段时间”,符合题意.