The project a success as the ine of the pany increases every year.
A. is proved
B. had proved
C. has proved
D. has been proved
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A. is proved
B. had proved
(答案→)C. has proved
D. has been proved
解析：考查时态。句意“那项计划已经被证明是一个成功，因为公司的收入每年都在增加。”叙述的是现在的情况，排除B；动作发生在过去，对现在造成的影响，用现在完成时。故选C。