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

A. While; soon B. For; right away

C. Once; at once D. Until; immediately

【答案】C

【解析】

試題第一空考查連詞：while雖然，for因為，once一旦until直到，第二空考查副詞，soon很快，right away立刻，at once立刻，immediately立刻，句意是：一旦機器開始工作，你就不能讓它停下。選C。

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