问题
There is a teacher’s desk ______ of the classroom. Mr. Liu is standing ______ of it.
A:in front, in the front
B:in the front, in the front
C:in the front, in front
D:in front, in front;
B:in the front, in the front
C:in the front, in front
D:in front, in front;
正确答案是：
