The matter your study surely requires carefully.
A. relating to；dealing with
B. related to；dealt with
C. related to；being dealt with
D. relating to；having dealt with
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(答案→)A. relating to；dealing with
B. related to；dealt with
C. related to；being dealt with
D. relating to；having dealt with
解析：relate to意为 “与……有关;涉及……”,第一空既可以用relating to，也可以用related to;deal with为固定短语,与the matter之间是被动关系,因此,应用dealing with(主动形式表被动意义)或to be dealt with。