单选题
It is thus of exceptional importance ______ extinction theories, but until now problems with dating have limited its potential.
A、
for a testing purpose on
B、
as a testing reason in
C、
as a testing ground for
D、
for some useful ends of
【正确答案】
C
【答案解析】
[注释]结构上需要as 来引导，[B] 的搭配不对，所以[C] 为正确答案。
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