He is very sick. I insist that a doctor immediately.
A. has been sent for
B. sends for
C. will be sent for
D. be sent for
网友回答
A. has been sent for
B. sends for
C. will be sent for
(答案→)D. be sent for
解析：这题考查虚拟语气，insist表示“坚持要求”，宾语从句用should+do，should可以省略，a doctor和send for是被动关系，选D。