火眼金睛。请找出下列病句中的一处错误,并把序号填在横线上。
( )Sarah: Bye, Wu Yifan. Wu Yifan:
( )你向你的妈妈介绍你的同学Sarah时,你说: A. Hello, Sarah. B. Hello, I’m Sarah. C. This is Sarah.
( )当你想向朋友介绍John, 你应该说: A. I am John. B. I am John. C. What is your name?
( )早上,你遇到怀特老师,你应该对他说: A. Good morning , Miss White. B. Goodbye , Miss White. C. Good morning , Mr White.
( )—— Good morning. —— . A .Hello. B .Good morning. C .Goodbye.