The cow gives us milk. Change into passive voice

Question: The cow gives us milk. Change into passive voice.

A) We are being given milk by the cow.

B) We were given milk by the cow.

C) Milk is given to us by the cow.

D) Milk is being given to us by the cow.

Answer:
C) Milk is given to us by the cow.

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I shall be teaching him. (Make it into passive voice)