We must have obeyed our teachers.

A Our teachers might have obeyed.

B Our teachers might have been obeyed.

C Our teachers must have been obeyed.

D Our teachers must have obeyed.

Solution

Correct Answer: Option C

If we have "Subject + Modal Auxiliary verb + have + third verb + object" then we change it to Passive subject + Modal Auxiliary verb + have been + third form + by + passive object. Modal Auxiliary verb are : can, could, shall, will, may, might, should, would, must, ought to etc.

Solution

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