that the government can clear up official corruption，we areabout the future of our country

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(答案→)A. Convinced；optimistic
B. Convincing；optimistic
C. Convinced；pessimistic
D. Convincing；pessimistic
解析：A　考查形容词辨析。convincing 令人信服的；convinced 相信的，信服的；convince与ongoing主语we之间为动宾关系，故用过去分词转化成的形容词做状语；optimistic乐观的；pessimistic悲观的。