问题详情

Because it takes longer to install and involves some tinkering to get it to work just right, it"s best for more experienced users. But, oh, what joy! ______ a detailed log of every ad it annihilates, ______ it makes a satisfying "thunk" when it nabs one.
A．Not only Killer keeps, but also
B．Not only does Killer keep, /
C．Only Killer keeps, and
D．Only if Killer keeps, /请帮忙给出正确答案和分析，谢谢！