Translate into English: তোমাকে চারটার মধ্যে ফিরতে হবে
A. You must be back since four O' clock
B. You must be back by four O' clock
C. You must be back before four O' clock
D. You must be back within four O' clock
সঠিক উত্তরঃ
D.
You must be back within four O' clock
