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Which one is the correct passive voice form of the sentence...

Which one is the correct passive voice form of the sentence below?

"They are building a new bridge across the river."


A

A new bridge across the river has been built by them.


B

A new bridge across the river have been built by them.


C

A new bridge across the river is being built by them.


D

A new bridge across the river was built by them.


E

A new bridge across the river will be built by them.