enough time, he was full of confidence to finish the project. A. OfferedB. Being offeredC

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(答案→)A. Offered
B. Being offered
C. Having offered
D. Offering
解析：考查过去分词做状语：句意：被提供足够的时间，他充满信心完成这项项目。逗号后面是个完整的句子，说明前面是非谓语动词做状语，因为he 和offer是被动关系，用过去分词做状语，选A。