根据对话内容, 从对话后的选项中选出能填入空白处的最佳选项。 选项中有两项为多余选项。 

M: Excuse me, Helen. 

W: It's a desk.

M:

W: D-E-S-K. 

M:

W: It's blue.

M: Is this your pen on the desk?

W: No, it's not my pen. My pen is in my schoolbag.

M:

W: It can(可能) be Linda's. You can ask Linda. I think it's her pen.

M: Let's go and ask her.

A. Who lost it here? B. What's this? C. How is it? D. How do you spell it? E. OK.  F. I know it's a pen. G. What color is the ruler?