The professor’s research finally proved to be , though he had spent a lot of money on it.A

发布时间：2020-08-16 10:49:44


The professor’s research finally proved to be     , though he had spent a lot of money on it.
A. priceless
B. valuable
C. worthless
D. worthwhile

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A. priceless
B. valuable
(答案→)C. worthless
D. worthwhile
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