:z;c'q1g9s7a:O'n,k'd)} It seems oil ___________ from this pipe for some time. We'll have to take the machine apart to put it right.4K2l.M*~2s'c2l*g4g
A.had leaked4K2l.M*~2s'c2l*g4g
B. is leaking4K2l.M*~2s'c2l*g4g
C. leaked4K2l.M*~2s'c2l*g4g
D. has been leaking4K2l.M*~2s'c2l*g4g