情景交际，选择恰当的句子，将序号写在横线上

A. Sorry, I can't. B. You're welcome. C. What's she doing? D. Where's Mum?

Daming:

Simon: She is in the kitchen.

Daming:

Simon: She's cooking food for supper.

Mum: I am very busy now. Who can help me wash the dishes?

Simon:I'm doing my homework.

Darning: I can help you, Mum.

Mum: Thank you, Daming.

Daming: