Helen is very good ___ speaking English.用适当的介词填空

问题描述:

Helen is very good ___ speaking English.用适当的介词填空

at
BE GOOD AT 固定词组‘ 擅长于……’

Helen is very good at speaking English.

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be good at 擅长于...
海伦说英语很好.

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be good at是擅长做某事的意思