2. 外语
  3. It is thus of exceptional importance ______ extinction theories, but until now problems with dating have limited its potential.

It is thus of exceptional importance ______ extinction theories, but until now problems with dating have limited its potential.

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问题 It is thus of exceptional importance ______ extinction theories, but until now problems with dating have limited its potential.
选项 A、for a testing purpose on
B、as a testing reason in
C、as a testing ground for
D、for some useful ends of
答案C
解析 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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