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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Identify the correct sentence from the four sentences given below. If none of them are are correct choose option "E"

A. While the operator was making the machine ready the fire alarm goes off.
B. The operator was making the machine ready, the fire alarm went off.
C. While the operator making the machine ready, the fire alarm went off.
D. While the operator was making the machine ready, the fire alarm went off
E. None of these
সঠিক উত্তরঃ D. While the operator was making the machine ready, the fire alarm went off
Explanation: