The project _______ a success as the income of the company increases every year. 
A．is provedB．had provedC．has provedD．has been proved
C
考查時(shí)態(tài)。句意“那項(xiàng)計(jì)劃已經(jīng)被證明是一個(gè)成功，因?yàn)楣镜氖杖朊磕甓荚谠黾��！睌⑹龅氖乾F(xiàn)在的情況，排除B；動(dòng)作發(fā)生在過去，對(duì)現(xiàn)在造成的影響，用現(xiàn)在完成時(shí)。故選C。
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