Who is that?___Professor Li.是it is不是this is

who is that boy,()is lee,that;this;it;he who is that和who is it who is that speaking?为什么回答是This is...speaking who is that和who's this Who is that ocer here?It is Who is that boy _____ _____?He is Li Ming. who is that?A.That's a student B.It's Bob C .This is Bob -Who is it?____ my mother.A.This is B.it is C.That is D.She who is that girl?回答是she is还是it is..可以回答she is me who is this和who is that有什么区别? Is that Li Lei?做肯定回答是Yes,it is.还是Yes,he is. This is That is There is It is 的分别