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When the UFO arrived, the girl was waiting for a bus. (改为一般疑问句)
________ the girl ________ for a bus when the UFO arrived?
答案:Was;waiting
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题目内容
句型转换
When the UFO arrived, the girl was waiting for a bus. (改为一般疑问句)
________ the girl ________ for a bus when the UFO arrived?