单项选择题

He said the most unusual aspect of the Mexican trial was that the 12 teenagers were not given any drugs to suppress their immune systems, ______ would normally destroy any cells from other animals.

A．at which
B．which
C．to which
D．as
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单项选择题
There ought to be less anxiety over the perceived risk of getting cancer than ______ in the public today.
A．exists
B．exist
C．existing
D．existed
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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