Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.

A．have walked

B．will be walking

C．have been walking

D．walked

神奇的魔术表演常常受到观众的热捧。关于魔术，下列说法正确的是

A．魔术表演是对规律的利用和改造

B．魔术表演者的创造性思维是奇幻形象的来源

C．魔术制造的奇幻情景是不存在的

D．魔术表演的神奇来自对客观条件的创造利用