I don’t believe these people have achieved success . They must have put much effort into their work.
A. by coincidence
B. as usual
C. in particular
D. on purpose
网友回答
(答案→)A. by coincidence
B. as usual
C. in particular
D. on purpose
解析：考查词组：A. by coincidence 巧合B. as usual像平常一样 C. in particular特别，尤其，D. on purpose故意的，句意：我不相信这些人取得成功是因为巧合，他们一定在工作上付出很大的努力。选A。