--- Do you really think I can achieve my goal ?
--- Absolutely . you give up halfway .
A. If
B. Unless
C. Since
D. because
网友回答
A. If
(答案→)B. Unless
C. Since
D. because
解析：考查连词：A. If 如果B. Unless除非C. Since自从D. because因为，句意：--你真的认为我能达到目标吗？--一定的，除非你半途而废。选B。