It is your duty to make tea at eleven O'clock.

A. You are asked to make tea at eleven O'clock.
B. Your are required to make tea at eleven O'clock.
C. You are supposed to make tea at eleven O'clock.
D. Tea is to be made by you at eleven

Explanation

"It is your duty to" expresses an obligation, which is naturally recast as "You are supposed to." Option b contains a grammatical error in "Your are," while d is awkward and incomplete in punctuation.

It is your duty to make tea at eleven O'clock.

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