从方框中选择合适的句子补全对话。

A.What's this? B.Would you like some milk? C.Shh! Don't shout here. D.Don't drink in the library.

A: Hello, Yang Ling!

B: 

A: Oh, I'm sorry. Look at my shirt.

B: It's nice.

A: It's milk.

B: No, thank you.  

A: Oh, I'm sorry.