The girlis singing an English song in the next room is Tom’s sister. A. whomB. whichC. who

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A. whom
B. which
C. whose
(答案→)D. who
解析：句意：正在隔壁房间唱英文歌曲的女孩是汤姆的姐姐。这里使用了定语从句，先行词是the girl，定语从句中缺少主语，用who或that引导定语从句，所以选D。