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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Choose the correct sentence.

A. I open the door as soon as I had heard the bell.
B. I had opened the door as soon as I heard the bell.
C. I had opened the door as soon as I hasd heard the bell.
D. I opened the door as soon as I heard the bell.
সঠিক উত্তরঃ D. I opened the door as soon as I heard the bell.
Explanation: