he is good at _______ 中的横线填swim还是swimming?

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he is good at _______ 中的横线填swim还是swimming?

he is good at _______ 中的横线填swim还是swimming?
he is good at _______ 中的横线填swim还是swimming?

he is good at _______ 中的横线填swim还是swimming?
当然是 swimming
因为be good at doing sth 固定用法‘ 擅长于……’ AT是介词,介词后的动词要用ING形式.
加油!不明白再问!

he is good at swimming

he is good at swimming.
good at 是词组,后面跟动词一定要加-ing。

he is good at _swimming?_
因为be good at + 动词ing形式 。
望采纳~