单选题 — Hello, is that Mrs Black speaking?— Yes, who's that?— ______ Mary.
【正确答案】 D
【答案解析】打电话需用打电话的专门用语,如问对方是谁,不能用“Who are you?”,而要用“Who's that?”。回答时也不能用“I'm…”,而要用“This is…”。做这类题千万不能按汉语的表达法去套。