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现在完成进行时 back




翻译: 后退, 支持

现在完成进行时



您是网页 常规动词 back

现在完成进行时 (Present perfect continuous)

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


不定式

back









规则动词 & 不规则动词