I soon found that the work I was doing had already been done by someone else. ，I was wasting my time.
A. In other words
B. In a word
C. First of all
D. Believe it or not
网友回答
(答案→)A. In other words
B. In a word
C. First of all
D. Believe it or not
解析：
试题分析:考查固定短语。A换句话说；B总之；C首先；D信不信由你。根据句意可知前句话和后句话表达了相同的意思，所以答案选A。句意：我很快发现我在做的工作已经被别人做过了，换句话说，我在浪费时间。