.I soon found that the work I was doing had already been done by someone else - I was wa

问题补充：

.

I soon found that the work I was doing had already been done by someone else - , I was wasting my time.

A. in a word

B. in all

C. in other words

D. in words

答案：

A. in a word

B. in all

(答案→)C. in other words

D. in words

解析：可联系答.案.网客服索取。