问题描述：
--- is tom still smoking?
--- Is Tom still smoking?
--- No.By next Saturday he ______ for a whole month without smoking a single cigarette.
A.will be B.will have gone
C.will have been D.has been going
为何不选C呢?
--- Is Tom still smoking?
--- No.By next Saturday he ______ for a whole month without smoking a single cigarette.
A.will be B.will have gone
C.will have been D.has been going
为何不选C呢?
问题解答：
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