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Some scientists believe that it won’t be long _______ robots are widely used in all walks of life.

A. since B. after C. before D. until

C

【解析】

试题分析:考查连词辨析。A自从B在…之后C在…之前D直到,句意:一些科学家相信在机器人广泛用于生活各方面之前不会过很久。故选C

考点:考查连词辨析

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