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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Which sentence is correct?

A. The students failed the experiment for not having studied the lab manual carefully.
B. Having arrived late for practice, a written excuse was needed.
C. Without knowing his name, it was difficult to introduce him.
D. To improve his results, the experiment was done again.
সঠিক উত্তরঃ D. To improve his results, the experiment was done again.
Explanation: