Whatever may happen, go on until you succeed, and you what life is all about.
A. will know
B. know
C. have known
D. will have known
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(答案→)A. will know
B. know
C. have known
D. will have known
解析：考查时态。句意：无论发生什么事，一直继续直到你成功，你就会知道生活是关于什么的。所以用一般将来时态。选A。