问题
选择题
---What’s made Ruth so upset?
--- ______ three tickets to the folk music concert.
A．Lost
B．Losing
C．Because of losing
D．Since she lost
答案
答案：B
根据问句：什么使如斯如此伤心呢？可推断出示对主语进行提问，从四个选项中可以看出B. Losing 可做主语，其余三项不能，所以选B。