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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

"I was doubtful whether he had passed." Negative form of it is-

A. I had no doubt whether he had passed.
B. I was not sure whether he had passed.
C. I was not doubtful whether he had passed.
D. I was not doubtless whether he had failed.
সঠিক উত্তরঃ A. I had no doubt whether he had passed.
Explanation: