从方框中选择适当的选项补全下列对话。

A. What about you? B. Welcome! C. Nice to see you, too. D. Today we have two new students. E. Nice to see you again.

Teacher: Good morning, children. Welcome back!

Class:

Teacher:

John: Hi, I am John. I'm from the UK.

Teacher:

Lucy: I'm Lucy. I am from Canada.

Class: