选择题：-Oh,there is someone in the room. -___ must be my mother.A She B This C It

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选择题：-Oh,thereissomeoneintheroom.-___mustbemymother.ASheBThisCIt选择题：-Oh,thereissomeoneintheroom.-___m

选择题：-Oh,there is someone in the room. -___ must be my mother.A She B This C It
选择题：-Oh,there is someone in the room. -___ must be my mother.
A She B This C It

选择题：-Oh,there is someone in the room. -___ must be my mother.A She B This C It
C 不确定性别