【多选题】If we want to show that there is a problem against a certain research background, we can use
A.
(Problems in certain research area) are …, yet (the present solution) has frequently been questioned because …
B.
This paper describes/presents … (the argument) within … (a theoretical context)
C.
Based on the idea that …, we conducted the present study, categorized …, and evaluated …
D.
While (the debate on certain research subject) seems to …, (the present agreement) is still problematic.