The public transportation is very convenient in that big city so therebe any difficulty

问题补充：

The public transportation is very convenient in that big city , so therebe any difficulty in

traveling around .

A. mustn’t

B. wouldn’t

C. shouldn’t

D. needn’t

答案：

A. mustn’t

B. wouldn’t

(答案→)C. shouldn’t

D. needn’t

解析：考查情态动词：A．mustn’t禁止，B．wouldn’t不会C．shouldn’t不该D. needn’t不必，句意是:在那个大城市公共交通很便利，这样在城市游玩不应该有什么困难。选C。