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(dòng)關(guān)系，所以使用過(guò)去分詞表示被動(dòng)。句意：一旦被發(fā)動(dòng)，那個(gè)機(jī)器將一直運(yùn)行。
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