While ____ the dog, you should take care
题型:选择题
问题:
While ____ the dog, you should take care not to get loose . Otherwise, it may be dangerous to strangers.
A.walking;
B.walked
C.walking for
D.training for
While ____ the dog, you should take care not to get loose . Otherwise, it may be dangerous to strangers.
A.walking;
B.walked
C.walking for
D.training for