单项选择题

______ how the immature brain prevents seizure-induced cell injury or death could lead to new methods to reduce or prevent seizure damage in adults.

A．To understand
B．To be understood
C．Having been understood
D．Understanding
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单项选择题
Rather than doing this via auction or through private art dealers they can give them to the government, which buys them at an agreed price ______ them ______.
A．after having, independently valued
B．after having, independently valuable
C．by having, independently valueless
D．by having, independently value
单项选择题
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
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