按要求句型转换:Mary was riding a bike at that time否定句一般疑问句两个回答特殊疑问句

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按要求句型转换:Mary was riding a bike at that time否定句一般疑问句两个回答特殊疑问句
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按要求句型转换:Mary was riding a bike at that time否定句一般疑问句两个回答特殊疑问句
按要求句型转换:Mary was riding a bike at that time
否定句
一般疑问句
两个回答
特殊疑问句

按要求句型转换:Mary was riding a bike at that time否定句一般疑问句两个回答特殊疑问句
Mary wasn't riding a bike at that time.
Was Mary riding a bike at that time?
Yes,she was./No,she wasn't.
What was Mary doing at that time?