Choose the correct passive voice transformation of the sentence: The archaeologists, after many years of searching, have discovered a hidden ancient tomb.
A hidden ancient tomb has been discovered by the archaeologists after many years of searching.
The active sentence is in the present perfect tense: 'have discovered'.
The passive form of the present perfect is 'has/have been + past participle', and it must agree with the new singular subject 'a hidden ancient tomb'.
So the verb becomes 'has been discovered', and the object of the active sentence becomes the subject of the passive.
Option A uses simple past 'was discovered', option C uses past perfect 'had been discovered', and option D uses simple present 'is discovered', all of which change the original tense.
Hence, the correct passive form is A hidden ancient tomb has been discovered by the archaeologists after many years of searching.
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