What's wrong with your forehead（前额）？
I knocked my head on the tree while I _____my dog．（ ）
A．walkedB．was walking
C．has walkedD．am walking
What's wrong with your forehead（前额）？
I knocked my head on the tree while I _____my dog．（ ）
A．walkedB．was walking
C．has walkedD．am walking
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