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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Of the four sentence below only one has used the correct preposition.

A. I called on him at his office
B. I called by him at his office
C. I called in him at his office
D. I called into him at his office
সঠিক উত্তরঃ A. I called on him at his office
Explanation: