________ the machine begins to work, yo...

________ the machine begins to work, you can’t stop it _____.

A．While; soon

B．For; right away

C．Once; at once

D．Until; immediately

C 【解析】试题分析：第一空考查连词：while虽然，for因为，once一旦until直到，第二空考查副词，soon很快，right away立刻，at once立刻，immediately立刻，句意是：一旦机器开始工作，你就不能让它停下。选C。考点：考查连词和副词

考点分析：

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