—Who’s the girl in red?—Sorry, I don’t know . — is a new student.A. she; SheB. her; SheC.

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A. she; She
(答案→)B. her; She
C. her; Her
D. she; Her
解析：此题考查的是人称代词，因答语中know是实义动词，故其宾语要用人称代词的宾格。做主语时要用主格，又因the girl是女孩，故用she，故选B。