We must get up early tomorrow we’ll miss the first bus to the Great WallA. soB. orC. but

问题补充：

We must get up early tomorrow， we’ll miss the first bus to the Great Wall．

A. so

B. or

C. but

D. however

答案：

A. so

(答案→)B. or

C. but

D. however

解析：此处so所以；or否则；but但是；however然而。句意：我们必须明天早起，否则，我们将错过去长城的第一趟班车。根据句意选B。