【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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