"Pertanyaan itu jarang" is the same with "pertanyaan itu tidak sering". Or we have to answer with the explicit meaning?
word "Jarang" has not been taught
pertanyaan itu tidak frekuen?
frekuen = sering
I think the explicit
Yes, Duo always expects the literal meaning so we can learn every word.
Literal meaning is not good, we can improve the translations by reporting, and making them more natural...