题目内容
﹣What's wrong with your forehead(前额)?
﹣I knocked my head on the tree while I_____my dog.
A. walked B. was walking C. has walked D. am walking
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题目内容
﹣What's wrong with your forehead(前额)?
﹣I knocked my head on the tree while I_____my dog.
A. walked B. was walking C. has walked D. am walking