No way to enter Zero in a Chinese year date
The Duolingo iPad ap appears to have no way to enter zero in a Chinese date like 2015. The 0 number from the iPad keyboard is marked as wrong. The Chinese character ling,零, is marked as wrong. Has anyone figured out how to enter it in a way that will be marked as right?
Do you have Chinese (Pinyin) Keyboard set up for iOS?
(Settings -> General -> Keyboards)
You can switch to the Pinyin keyboard and type "ling". You then get a menu of choices, including both 〇 and 零.
I suspect that the more complex version of zero is such a nuisance to write out, that they adapted the circle to be similar to the Arabic zero.