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现在完成进行时 interchange




翻译: (指两人等)交换, 切磋

现在完成进行时




现在完成进行时 (Present perfect continuous)

I
have been interchanging 
you
have been interchanging 
he/she/it
has been interchanging 
we
have been interchanging 
you
have been interchanging 
they
have been interchanging 


不定式

interchange









规则动词 & 不规则动词