How long did it take the patient to resume her normal activity after the operation？ ______

How long did it take Byrd and his colleagues to fly from Little America to the South Pole

How long do you think______to finish this urgent task？A．did it take youB．it will take youC

听力原文：How long did you live in Seattle of the United States？（A) It is a beautiful city

How long does it take to cover the workbook material？A．For more than a term.B．For less tha

How long does it take for the runners to cross the starting line in recent Marathon races？

According to Obamas 2011 blueprint, how long would it take for illegal immigrants to gain