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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

The correct passive form of the sentence, "Who has created this mess?"

A. Who has been created this mess?

B. By whom is this mess created?

C. By whom has this mess been created?

D. By whom has this mess being created?

সঠিক উত্তরঃ C. By whom has this mess been created?

Explanation:

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