How long will our supplies of food and water hold______？A．upB．overC．inD．out

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 will Mr. Welsh be in training？A．1 weekB．2 weeksC．3 weeksD．4 weeks

（How) can I convince you （of that) we have almost （used) up our （supplies)？A．HowB．of thatC

How long will the order take to arrive？A．3 daysB．4 daysC．7 days

Nobody yet knows how long and how seriously the shakiness in the financial system will the