Once , the machine will keep running.A. startB. startedC. to startD. starting

发布时间:2020-08-16 22:34:58

Once      , the machine will keep running.
A. start
B. started
C. to start
D. starting

网友回答

A. start
(答案→)B. started
C. to start
D. starting
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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