题目内容：

May I speak to Mr.Smith,please ?Sorry,he is not in . Who is ( this) ?(This )is Jack这个句子对吗?
要有依据,回答得好可以多加分

优质解答

完全没错!我在北美的一家银行工作,Bank of Nova Scotia,天天打电话,相信我,你这用法没问题!Who's this?您是哪位?This's Jack!我是Jack!更客气一点的说法是：Excuse me,who am I speaking with?我是在跟谁讲电话呢?Oh...