After months of voyage, Columbus arrived in what later to be a new continent.
A. had been proved
B. was proved
C. had proved
D. proved
网友回答
A. had been proved
B. was proved
C. had proved
(答案→)D. proved
解析：考查系动词用法。任何一个系动词都没有被动语态没有进行时。句意：经过几个月的航海以后，哥伦布到达了后来证明是一个新的大陆的地方，故D正确。