great help, I could get rid of all the difficulty and succeeded in the endA. OfferedB. Ha

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(答案→)A. Offered
B. Having offered
C. Being supplied
D. Having supplied
解析：
试题分析:句意：被给予了极大的帮助，我最后终于克服了困难，获得了成功。从结构可知此处是非谓语做状语，句子主语I 和动词offer之间是被动关系，排除BD选项。再根据句意可知此处只强调被动，不强调正在进行的动作，故答案选A。