根据对话内容,从下面方框中选出恰当的句子补全对话,有一个选项的多余的。

Amy: Hello, Steven! It is Saturday. Would you like to play basketball with me? 

Steven: I'm busy now.

Amy: What are you doing? 

Steven: 

Amy: Come on! You can do it tomorrow. 

Steven: Sorry, I must finish it today. But I can play basketball with you tomorrow. 

Amy: OK. 

Steven: In the afternoon. 

Amy: OK.  I should learn from you. 

Steven: Thanks. Let's study and exercise together.

Amy: Good idea. I'll do my homework with you.

Steven: All right. Let's work together.

A. Sorry, I'm afraid not. B. When can we play basketball tomorrow?  C. I am doing my homework.  D. And let's play basketball tomorrow afternoon. E No wonder you are always getting good grades.  F. Where are you now?