Once _____ , the machine will keep running.A.startB.startedC.to startD.starting
题型:不详难度:来源:
Once _____ , the machine will keep running.A.start | B.started | C.to start | D.starting |
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答案
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。 |
举一反三
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