The boy is seriously injured. So he is supposed to hospital as soon as possible.A. to be

问题补充：

The boy is seriously injured. So he is supposed to hospital as soon as possible.

A. to be sent

B. to send

C. being sent

D. sending

答案：

A. to be sent

B. to send

C. being sent

D. sending

解析：考查词组：be supposed to do应当做…，he和send是被动关系，用不定式的被动，句意：男孩伤得很重，所以他应该尽可能快的被送进医院。选A。