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：考查介词短语辨析。A巧合，碰巧；B和平时一样；C尤其，特别；D故意；句意：我不认为这些人是碰巧取得成功的，在工作中他们肯定付出了很多的努力。故A正确。