问题
                    
Thefellowhasbeensuspected________anemailfraud. —Nowadayscybercrimeisdeveloping________anamazingrate. [ ]
                            A: from;at
B: about;in
C: of;with
D: of;at
                        
                        B: about;in
C: of;with
D: of;at
正确答案是:
                        