Can you tell me ________ the train was invented? A. what B. who C. when D. which
2022-10-28 09:23:35 54次 人教版九年级下册英语 unit6 第5课时（sectionB 2a-2e）测试 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Can you tell me ________ the train was invented?
A. what B. who C. when D. which
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