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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

How often do the buses run? Which sentence correctly rewrite the question above?

A. Do you know how often the buses ran?
B. Do you know how often the buses run?
C. Do you know how often do the buses run?
D. Do you know how often did the buses run?
সঠিক উত্তরঃ B. Do you know how often the buses run?
Explanation: