A doctor ____ for six years afterfinishing school 填study的一种形式

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A doctor ____ for six years afterfinishing school 填study的一种形式
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A doctor ____ for six years afterfinishing school 填study的一种形式
A doctor ____ for six years afterfinishing school 填study的一种形式

A doctor ____ for six years afterfinishing school 填study的一种形式
has been studying

have been studying
或 have studied
现在完成进行时或现在完成时(后面是for+一段时间)

has been
for six years 提示用现在完成时,然后用第三人称。
希望帮到你!

have studied