A. I was working
A.
B. I have been working
B.
C. I had been working
C.
D. I will be working
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
Present Perfect Continuous Tense: This tense is used to express an action that started in the past and is still continuing up to the present moment.
"Since 7 o'clock in the morning" indicates a starting point in the past, and the speaker is still tired, implying that the action is ongoing.