I soon found that the work I was doing had already been done by someone else— __

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

选项 A、in fact
B、in other words
C、in a word
D、as a result

答案 B

解析 in other words“换句话说”；in a word“总而言之”；as a result“因此”。

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