Mr Smith is walking.对 is walking 提问

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MrSmithiswalking.对iswalking提问MrSmithiswalking.对iswalking提问MrSmithiswalking.对iswalking提问WhatisMr.Smit

Mr Smith is walking.对 is walking 提问
Mr Smith is walking.
对 is walking 提问

Mr Smith is walking.对 is walking 提问
What is Mr.Smith doing?