--Hello,I'd like to speak to John,please.

问题描述:

--Hello,I'd like to speak to John,please.
--_____
A:No,I'm Mary.
B:This is Mary speaking.
C:It's him here.
D:This is him.

回答电话,一半用this is或it is +sb speaking,所以这题选BD为啥不行him不对啊