---Why are the four students so happy?　in the science competition, they are awarded pr

---Why are the four students so happy?　
--- in the science competition, they are awarded prize money totaling $20,000.
A. Judged the best　　　　　　　
B. Judging the best　　
C. To be judged the best 　　　　
D. Having judged the best

(答案→)A. Judged the best　　　　　　　B. Judging the best　　C. To be judged the best 　　　　D. Having judged the best解析：考查非谓语动词。句中逻辑主语为they，与judge之间为被动关系，故用过去分词。根据句意选择A。

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