Is that Mike speaking?如何回答

Is that Mike speaking?如何回答 is that mike speaking的意思 who is that speaking?为什么回答是This is...speaking John:Hello!Is that Mike speaking?Mike:1 .John:Mike,do you en 怎么回答is that tom speaking? -Hello!Is that Mike speaking?-1 -Mike,do you enjoy your new ________?-------This is Mike speaking. Who is that speaking 回答用this 还是that a:hello.who's that?b:（）.（）is mike speaking.I have a fever.I 选择填空.1:Hello.( )is Mike speaking.A:That.B:This.C:You. ---------------------is that speaking Who is that speaking?