单项选择题

He said the most unusual aspect of the Mexican trial was that the 12 teenagers were not given any drags 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 pub lie today.
A．exists
B．exist
C．existing
D．existed
单项选择题
And while we ______ have a great deal of trouble adjusting to a climate that gets 2 degrees Centigrade warmer over the next century, an ice age by mid-century ______ be unimaginably devastating.
A．might, could
B．could, might
C．would, might
D．might, would
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