The police are to conclude that the cause of fire was a cigarette end.
A. probable
B. possible
C. maybe
D. likely
网友回答
A. probable
B. possible
C. maybe
(答案→)D. likely
解析：考查近义词的用法：这几个词都有“可能”的意思，C. maybe是副词，A. probable，B. possible和D. likely都是形容词，但likely可以接sb/sth is likely to do“某人某物有可能做…”，句意是：警察有可能下结论说火灾的原因是香烟头。选D。