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    【题目】________its tests successfully, the driverless car will appear on the market soon.

    A.UndergoingB.UndergoneC.To undergoD.Having undergone

    【答案】D

    【解析】

    考查非谓语动词。句意：已经成功经历了测试，无人驾驶车辆很快就会出现在市场上。分析句子可知，此处应用非谓语动词作状语，the driverless car和undergo之间是逻辑上的主动关系，故应用现在分词，又“经历测试”的动作发生在“出现”之前，故用现在分词的完成式having done，故选D项。

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