题目

15. _____ U2, the Irish rock band from Dublin perform a concert in Beijing, tell me in advance. A. If                     B. Shall                 C. Should              D. Would 答案：C 解析: should意思是“万一”，表示可能性，通常用于条件句中。如果省略掉if，通常把should提前。此句可还原成If U2, the Irish rock band from Dublin performs...。

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