—Mum, I don’t think I am qualified enough to do this—Honey, be confident! You should know

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A. that; that
B. how; that
C. what; that
D. that; how
解析： 考查强调句型和主语从句。it is      a man thinks of himself …    really determines his fate．是一个强调句型，第二空填that；去掉it is。。。that后，剩下     a man thinks of himself really determines his fate，而     a man thinks of himself是句子作主语，是主语从句，且这个从句缺少of的宾语，要用what。所以选C。