问题描述：
When I don't understand the math problem, Tom always helps me with it , he is my walking ________.
When I don’t understand the math problem,
Tom always helps me with it , he is my walking ________.
A. director B dialogue C. dictionary D. duty
When I don’t understand the math problem,
Tom always helps me with it , he is my walking ________.
A. director B dialogue C. dictionary D. duty
问题解答：
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