U2, the Irish rock band from Dublin perform a concert in Beijing, tell me in advance.
A. If
B. Shall
C. Should
D. Would
网友回答
A. If
B. Shall
(答案→)C. Should
D. Would
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...。