Once _____ , the machine will keep running.
A．startB．startedC．to startD．starting
B
考察分詞用法。The machine與start構(gòu)成被動關(guān)系，所以使用過去分詞表示被動。句意：一旦被發(fā)動，那個機(jī)器將一直運(yùn)行。
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