问题补充:
You can’t imagine what great trouble the doctor had the patient.
A. treats
B. treating
C. to treat
D. treated
答案:
A. treats
(答案→)B. treating
C. to treat
D. treated
解析:考查固定搭配。the doctor had the patient是定语从句,先行词是great trouble,代入定从,应是the doctor had great trouble(in)treating the patient,考查做某事有困难结构,所以选B。