Question

All the files ______been removed(have)​

Answer 1

AnSweR:-

☞ All The files $\red{\underline{\bold{had}}}$ been removed.

☞ All The files $\pink{\underline{\bold{have}}}$ been removed.

• If the past participle is being used as a verb form, the construction 'have/has been + past participle' ( or V3, as you call it) is always a passive.
• The money has been stolen. The houses have been built. The food has been eaten.
• However, the V3 form frequently functions as an adjective.

Hope It Helps You ✌️

Answer 2

$\bf\underline{\underline{Answer:}}$

All the files have* been removed.

*had can also be used in the sentence, depending on what the tense is. In this sentence, have or had, both are correct.

$\textsf{Hope that helps! }$