摘要： -What makes him so happy? - a prize in the computer contest. A. Because of winning B. For he won C. Winning D. He won [解析]选C.通过问句what可知.答语应是名词或兼有名词性质的词.答语为省略形式.完整句子应是“Winning a prize in the computer contest makes him so happy. 故选C.

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