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问题: 大学英语2 阶段作业4 系列问题2 需给出详细解释

2.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
D. in the front of; at back of

解答:

选B.带the表示在某物内部的方位,不带则是在某物外部的方位.