题干
Tom sits the classroom while John sits the room.
A：in front of; at back of
B：in the front of; at the back of
C：in front of; at the back of
答案(点此获取答案解析）
B
Tom sits the classroom while John sits the room.
A：in front of; at back of
B：in the front of; at the back of
C：in front of; at the back of
