Active to passive: perfect continuous (has/had been + -ing -> has/had been being + past participle)

1. A.
   Maintenance of the archives had been neglected by them for years.
2. B.
   Maintenance of the archives is being neglected by them for years.
3. C.
   Maintenance of the archives was being neglected by them for years.
4. D.
   Maintenance of the archives has been being neglected by them for years.

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1. A.
   Complex amendments had had been been debated by the committee when the bell rang.
2. B.
   Complex amendments had been being debated by the committee when the bell rang.
3. C.
   Complex amendments had be being debated by the committee when the bell rang.
4. D.
   Complex amendments had debated by the committee when the bell rang.

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1. A.
   The deal had been negotiating for months.
2. B.
   The deal had been being negotiated for months.
3. C.
   The deal has been being negotiated for months.
4. D.
   The deal was being negotiated for months.

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1. A.
   Alternative scenarios had not had been considered sufficiently.
2. B.
   Alternative scenarios were not being considered sufficiently.
3. C.
   Alternative scenarios had not considered sufficiently.
4. D.
   Alternative scenarios had not been being considered sufficiently.

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