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Once _____ , the machine will keep runni...

Once _____ , the machine will keep running.

A.start

B.started

C.to start

D.starting

 

B 【解析】考察分词用法。The machine与start构成被动关系,所以使用过去分词表示被动。句意:一旦被发动,那个机器将一直运行。
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