I'm not sure whether this is the room she left her dictionary. A. whereB. thatC. whichD.

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(答案→)A. where
B. that
C. which
D. in that
解析：考查定语从句：先行词是the room，定语从句中缺少地点状语，用where或in which引导定语从句，句意：我不确定是否这就是她丢了字典的房间。选A。