A:①和②
B:② 和③
C:②和④
D:①和④
A: Who's that ____( boy / girl) ?
B: He's my brother.
A: Is the ____( man / woman) your mother?
B: Yes, she is.
A:____ (What's / Who's) that man?
B: Guess.
A: Is ____( he / she) your father?
B: No, he isn't.____ (She's / He's ) my teacher.