A、  B、  C、  B本句是询问什么时候去澳大利亚的When疑问句。

Where is the laptop I was using?
(A)In conference room F.
(B)We are used to it.
(C)Yes, it’s brand new.

When are you flying to Australia?
(A)I have some family there.
(B)At the end of June.
(C)A four-hour difference.