很简单的英语问答题

问题描述:

很简单的英语问答题
Is that Mary speaking?
A.Yes,I'm Mary.
B.No,I'm her daughter.
C.Sorry,she isn't in.
D.Yes.Who are you?

选C.Sorry,she isn't in.
A.应该改成Yes,this is Mary.
B.应该改成No,this is her daughter speaking.
D.应该改成Yes.who is it?