The single market is debut just as Europe traverse one of its roughest economic storms in year.
A、last performance
B、best show
C、first appearance
D、previous idea
【正确答案】：C
【名师解析】:题目中的句子 "The single market is debut just as Europe traverse one of its roughest economic storms in year." 描述的是单一市场在欧洲经历最严重的经济风暴之一时首次亮相。这里的关键词 "debut" 意味着首次出现或首次公开展示。因此，选项C "first appearance" 是正确答案，因为它与 "debut" 的含义相符，即首次出现或首次公开展示。其他选项A "last performance"（最后的表现）、选项B "best show"（最好的展示）和选项D "previous idea"（之前的想法）都不符合句子的语境。
