Although there are occasional outbreaks of gunfire, we can report that the rebellion has in the main been ______.

【正确答案】 C

【答案解析】 解答该题的关键是根据主语的特点来确定答案。空格填入动词的直接主语是the rebellion(起义、暴动)，选项中与此名词搭配合理的只有suppressed(被镇压)，故答案为C。