问题
选择题
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
答案
答案：C
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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
答案：C