Translation:Can we take a bus to the school?
Haha! I never thought of that (I'm in California). To take a bus to school sounds (if you are not accustomed to the phrase) like you are driving the bus there, or putting a bus in your pocket to take to school. I'm 54 years old and have only spoken Anerican English my entire life.
"Will we take the bus to school?" should also be accepted.
In other exercises, 可以 is translated as 'will', and 'can' is not accepted. I know it's still in Beta, but I'm doing so much reporting. I'm at the point where I'm spending more time trying to remember what answers will be accepted, rather than focusing on learning.