问题描述：
1. he was swimming at nine o"clock last sunday morning【对划线部分提问】 ____ _____he_____at nine o"clock last sunday morning. 2.the woman was shopping when she saw a car accident 【改为疑问句】 _____the woman ____when she saw a car accident. 3. we were talking loudy when the teacher came in【对划线部分提问】 ______ ______you _____when the teacher came in? 4.he clan the blackboard yesterday 【用 at this time yester】 he_______ ________the blackboard at this them
问题解答：
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