The government has declared its strong position ________ the prevention of river pollution．
A.consideringB.regardingC.concernedD.providing在线课程B
句意：政府关于如何防止河流污染问题表明了坚定立场。considering．“鉴于”；regarding．“关于”；concerned改为concerning也可作介词用，意为“关于”；providing意为“假设……”，引导条件状语从句。