I soon found that the work I was doing had already been done by someone else－ , I was wasting my time.
A. what’s worse
B. all in all
C. all the best
D. in other words
网友回答
A. what’s worse
B. all in all
C. all the best
(答案→)D. in other words
解析：考查固定搭配。A更糟糕的是；B总的说来；C万事如意；D换句话说；句意：我很快就发现我正在做的工作已经被别人做了。换句话说，我是在浪费时间。根据句意说明D正确。