—Excusemcareyouwaitingforthebus?—YesIamButth

— Excuse mc, are you waiting for the bus?

— Yes, I am. But the bus is so late.______, how can I get to No.1 Middle School?

A. In the way

B. On the way

C. Out of the way

D. By the way

正确答案：D

从整个语境中可以看出所填部分为一独立成分是引起所问问题的插入语应用bytheway意思是“顺便问一下”