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.
--_____
A：No,I'm Mary.
B：This is Mary speaking.
C：It's him here.
D：This is him.
问题解答：
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