GRE考试

【单选题】Few mathematicians are______their futures on finding any such proof；instead, their efforts are focused on finding good, but not______, solutions for most cases, a field of study aptly known as approximation theory.
A、betting… perfect
B、developing … convenient
C、pinning … substandard
D、destroying … exact
E、establishing … vague
网考网参考答案：A
网考网解析：
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