Some scientists believe that it won’t be long _______ robots are widely used in all walks of life．
A．sinceB．a(chǎn)fterC．beforeD．until
C
考查特殊句型。It be 一段時間 before從句;表示一段時間以后某事才發(fā)生。句意：一些科學(xué)家認(rèn)為不就以后機(jī)器人就將在各個領(lǐng)域廣發(fā)被使用。故C正確。
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