who was不能缩写

例句

1、

Who was it that won the US Open?

在美国公开赛上获胜的是谁

2、

She made it her business to find out who was responsible.

她一定要查清楚到底该谁负责。

3、

She made it her business to find out who was responsible.  

她一定要查清楚到底该谁负责。