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题目
题型:不详难度:来源:
Once _____ , the machine will keep running.
A.startB.startedC.to startD.starting

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。
核心考点
试题【Once _____ , the machine will keep running.A.startB.startedC.to startD.starting】;主要考察你对现在分词等知识点的理解。[详细]
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