________ the machine begins to work, you can’t stop it _____.
A．While; soonB．For; right awayC．Once; at onceD．Until; immediately
C

試題分析：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。
點評：連詞的考查在于辨別不同的連詞含義，在做題時注意上下文的邏輯關(guān)系。
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