1.

Change the following sentences into passive voice: The smoke of the factory had polluted the fresh air

A. The fresh air had polluted the smoke of the factory.
B. The fresh air had been polluted by the smoke of the factory.
C. The fresh air had been polluted with the smoke of the factory.
D. None of the above.
Answer» C. The fresh air had been polluted with the smoke of the factory.


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