The sign reading No Photos means that no one take any photos in the Palace Museum.A. need

问题补充：

The sign reading No Photos means that no one take any photos in the Palace Museum.

A. need

B. may

C. must

D. shall

答案：

A. need

B. may

C. must

(答案→)D. shall

解析：考查情态动词。 shall表示“明文规定”，可根据No Photos判断。句意：标志写着“禁止拍照”，意味着没有人在故宫允许拍照片。