Oh,there is someone in the room.()must be my brother A he B It C She D

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Oh,thereissomeoneintheroom.()mustbemybrotherAheBItCSheDOh,thereissomeoneintheroom.()mustbemybrotherA

Oh,there is someone in the room.()must be my brother A he B It C She D
Oh,there is someone in the room.
()must be my brother
A he B It C She D

Oh,there is someone in the room.()must be my brother A he B It C She D
B
it 做代词指代未知的人(不确定的人)或者婴儿和物体