Why wouldn't "Which subway are we taking?" work?
This is what I put, and it was accepted.
A native English speaker would always say which subway are we taking
"going with" is improbable - "taking" is more likely
Subway means something else in British English, I think 'Which tube/Tube are we taking?' is also acceptable.
I would say underground should be accepted too.
Why do you meed "med"? Could you just omit?
"Which metro are we going with" isn't correct?
A few lessons back it had gar so I used taking this time. Not accepted
Microphone still sucks...
Comments above not answered. Not every English speaker says "subway".