You will succeed in the end you give up halfway.A. ifB. unlessC. now thatD. Until

问题补充：

You will succeed in the end you give up halfway.

A. if

B. unless

C. now that

D. Until

答案：

A. if

(答案→)B. unless

C. now that

D. Until

解析：句意：如果你不半途而废，你最后将会成功。A. if如果，是否；B. unless除非，如果不；C. now that既然，由于；D. Until直到…时。根据句意故选Ｂ。