The young man was serious ill,He()to the hospital at once

问题描述:

The young man was serious ill,He()to the hospital at once
will send
must send
must be sent
sent
需要原因谢谢

must be sent.因为他得了严重的病,所以必须马上送医院,所以第一项和第四项排除(因为不含必须),这个句子 根据句意表示为被动语态(既然严重就肯定需要他人送往医院),所以第三项符合.