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】

試題分析：考查連詞辨析。A自從B在…之后C在…之前D直到，句意：一些科學(xué)家相信在機器人廣泛用于生活各方面之前不會過很久。故選C

考點：考查連詞辨析

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