Elizabeth has already achieved success her wildest dreams. A. atB. beyondC. withinD. upon

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A. at
(答案→)B. beyond
C. within
D. upon
解析：考查介词辨析。根据achieved success和wildest可以推断出此处所填介词意思是：超出，为……所不及，选B；at表示“点”；within表示“在……里”；D项等于on，意思是：依靠，凭借。