📝 Multiple Choice Question
General-english
Select the correct passive form: They have built a perfect dam across the river.
A
A perfect dam has been built across the river.
B
A perfect dam has been built by them across the river.
C
Across the river a perfect dam was built.
D
A perfect dam had been built across the river.
Explanation
'Has been built' is the correct tense. 'By them' is usually omitted when the agent is obvious or unimportant.
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