英语.I soon found that work I was doing had alreI soon found that work I was doing had already been done by someone else
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【C】原因：句意是说我很快发现我所做的那个工作已经被人做了,换句话说我是在浪费时间.
in other words的意思就是换言之,换句话说.
A是结果的意思.（没有做完算不上是结果,结果也是他做这件事的结果,前后 也不存在因果关系）
B是那个时候
D是一方面从意思上来说只有C最合适
======以下答案可供参考======
供参考答案1:
C