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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

Which of the following sentence is the correct example of "future perfect continuous tense"? 

A. You will be doing the work 
B. I shall have done the work before my father comes 
C. Before you go to see him, he will have left the place 
D. I shall have been doing the work before my father comes
সঠিক উত্তরঃ D. I shall have been doing the work before my father comes
Explanation: