why is 'we are reading' not allowed
Halo teman! It is also a valid translation, so it can be added with the reporting tool to the alternative too.
Selamat belajar! :)
We read = Kita membaca
We are reading = Kita sedang membaca
Note that the Present Continuous form requires you to add the word "sedang"
Other words may be used as well, such as "tengah" and "lagi"