You will succeed in the end you give up halfway.A. even ifB. as thoughC. as long asD. unl

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A. even if
B. as though
C. as long as
(答案→)D. unless
解析：词义辨析。even if即使，甚至；as though仿佛，好像；as long as  只要；unless除非。。。否则，如果不。如果你不半路放弃，最终一定会成功。所以选D。