Translation:Do we write in centimeters or in kilometers?
I didn't notice the question mark and simply stated "We write in centimetres or kilometres" and was marked correct! Oops!
I have write "We write this in centimeters or in kilometers?" and it says wrong.
Nihou is probably correct - it could also be that in correct English, questions are always begun with certain words: Do, How (many), Can, Where, May, When, Why, etc. etc.
I wrote - Will we write in centimeters or kilometers - and it was marked wrong. This was much closer to being correct than some than I've got away with