—The old man is ill. He to the hospital at once--Don’t worry. A doctor to come already

—The old man is ill. He to the hospital at once.
--Don’t worry. A doctor to come already.
A. must be sent , has asked
B. must send, have asked
C. must be sent, has been asked
D. must send, have been asked

A. must be sent , has askedB. must send, have asked(答案→)C. must be sent, has been askedD. must send, have been asked解析：句意：---这个老人生病了他必须马上被送到医院，----不要担心，医生已经被叫来了。 Must be done 表示含情态动词的被动语态，完成时的被动语态have been done 结构，根据题意可知选C

回答的不错