题目内容

Some scientists believe that it won’t be long _______ robots are widely used in all walks of life．
A．sinceB．afterC．beforeD．until
C
考查特殊句型。It be 一段时间 before从句;表示一段时间以后某事才发生。句意：一些科学家认为不就以后机器人就将在各个领域广发被使用。故C正确。
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