Question

Who is speaking？

— You are wanted on phone!
— I'm coming! Who is __ speaking?
A. it B. /

到底应该说Who is speaking，还是Who is it speaking?
老师的答案是选A，但我觉得是选B。

Answer 1

是选A。

—你的电话！
—我来了！是谁打来的？

Who is speaking? “请问是你谁？” 是在亲自接听电话的情况下问对方是谁。
Who is it speaking? “谁打来的电话？” 问的是第三者。