"This shirt is more expensive than that one" should be accepted
Seems fixed 2018-03-22
Not fixed 6-5-18
Here and elsewhere a good native speaker editor is needed. The app.allow for some "flexibility" too...there if often times more than one correct answer.
Yes...I reported too many times for the chinese courses
I answered as "than that 1." Since the similar one about pants was incorrect when answered as "than that pair" and the correct answer was "than that 1". The answers are a bit inconsistent and need rounding out in the flexibility.
Just a note on English grammar... If 'one' is being used as a pronoun, you shouldn't use a numeral '1'.
This shirt is more expensive than that.