______from work,jOHN found a new letter in the boxa.When he returning B.On returning C As he return D.While returning 选的是B 这道题的知识点是什么,写清楚

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______from work,jOHN found a new letter in the boxa.When he returning B.On returning C As he return D.While returning 选的是B 这道题的知识点是什么,写清楚
______from work,jOHN found a new letter in the box
a.When he returning B.On returning C As he return D.While returning 选的是B 这道题的知识点是什么,写清楚

______from work,jOHN found a new letter in the boxa.When he returning B.On returning C As he return D.While returning 选的是B 这道题的知识点是什么,写清楚
答案是B
on doing something ,…… 的意思是 一做了某事,就.
这就话的翻译是,一回到家,John就发现了信箱里的信
有什么不懂得再问我哦!