问题补充：
— Where is the post office?
— It’s the hospital.
A. in the front of
B. in the front
C. in front
D. in front of
答案：
A. in the front of
B. in the front
C. in front
(答案→)D. in front of
解析：in the front of在前部，物体内的前部；in the front在前部，范围内；in front在前面，在前方，物体外部的前面，范围外；in front of在……的前面，物体外部的前面。句意：邮局在哪儿？——在医院前面，选项C不能接宾语，故选D。
