this is ...(介绍你自己是谁,这是英文说话习惯),what's that?(介绍完自己再问别人是谁这是比较礼貌的)
只有who
is
this才是打电话问对方的身份,而who
is
that是在街上见到人问的。
【望采纳~~~】
Hello, may I know who's on the line?
who is this?
who is talking?
who's on(the phone)?
在美国有很多方式,就跟你说这几个简单的了.
who's that?. who's speaking ?