33%
Complete the marine archaeologist's excited journal entry about a mythic discovery. Select the best option for each blank.
For centuries, the legendary sunken city ______________________________ _________________________________ by the sea in a fit of divine rage, at least until our recent sonar scans proved it was just a massive sinkhole.
For centuries, the legendary sunken city had been considered to have been swallowed by the sea...
This sentence requires two passive verbs in sequence to convey the correct meaning and timeline.
First, the city had been considered (past perfect passive) by historians over a period of time before the recent sonar scans.
Second, it was considered to have been swallowed (perfect passive infinitive) because the mythical event of being swallowed happened even earlier in the past, and the city was the receiver of this watery fate!