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Change the voiceHe has been doing the work for a month.

A. The work has been done by him for a month.
B. The work has been being done by him for a month.
C. The work had been being done by him for a month.
D. The work had been done by him for a month.
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সঠিক উত্তরঃ B. The work has been being done by him for a month.
Explanation: