问题补充：
It is suggested that a doctor immediately.
A. be sent for
B. send for
C. is sent for
D. should send for
答案：
(答案→)A. be sent for
B. send for
C. is sent for
D. should send for
解析：正确选项AIt is suggested that...结构中，主语从句应用虚拟语气，即用动词原形或“should + 动词原形”。句中的send for和a doctor之间为被动关系，因此应用被动形式。
