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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Identify the correct passive form of "Who did this?"

A. By whom was this done?
B. By whom has this done?
C. By whom this has been done?
D. By Whom this had been done?
সঠিক উত্তরঃ A. By whom was this done?
Explanation: