A:启迪蒙蔽磨练摧垮高扬贬抑
B:磨练摧垮高扬贬抑启迪蒙蔽
C:启迪蒙蔽高扬贬抑磨练摧垮
D:磨练摧垮启迪蒙蔽高扬贬抑
I had difficulty _______ the maths problem.