Security vulnerability testing uses the simulation of attacks and other kinds of penetration testing （） to compromise the security of a system.
A.attempted
B.attempt
C.attempting
D.to attempt
正确答案：attempting
Security vulnerability testing uses the simulation of attacks and other kinds of penetration testing （） to compromise the security of a system.
A.attempted
B.attempt
C.attempting
D.to attempt
正确答案：attempting