Only when you what you have learned to practice say you have made it.
A. stick; can you
B. apply; can you
C. use; you can
D. appeal; can you
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(答案→)A. stick; can you
B. apply; can you
C. use; you can
D. appeal; can you
解析：考查：Only +状语放在句首，使用部分倒装，句意：只有当你把所学的东西坚持用到实践中，你才能说你已经成功了。Stick 坚持，后面倒装can提前。所以选A。