题目内容
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They were talking when their teacher came in. (对画线部分提问)
________ ________ they ________ when the teacher came in?
答案：
解析：
解析：
|
What, were, doing |
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句型转换
They were talking when their teacher came in. (对画线部分提问)
________ ________ they ________ when the teacher came in?
|
What, were, doing |
阅读快车系列答案