Change the following from active to passive: They will have inaugurated the metro line by next year.

The metro line will have been inaugurated by next year.
The metro line will be inaugurated by next year.
The metro line has been inaugurated by next year.
The metro line will being inaugurated by next year.

Correct answer: The metro line will have been inaugurated by next year.

Solution

The active sentence is in the future perfect tense: "will have inaugurated." In passive voice, the object "the metro line" becomes the subject, and the structure becomes "will have been inaugurated."

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