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

How long will it take for you to make a contribution？你需要多长时间才能做出明显的贡献？

How long will it take for you to make a contribution？你需要多长时间才能做出明显的贡献？

How long does it take for some industries acquiring commercial potential？A．From five to te

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

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

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