---Mary was being badly treated when John happened to pass by and helped her out
---I think it was not a pure but had been well planned.
A. coincidence
B. occurrence
C. arrangement
D. incident
网友回答
(答案→)A. coincidence
B. occurrence
C. arrangement
D. incident
解析：句意:---那天玛丽正受人欺负,这时约翰碰巧经过给她解了围。---我想这决非巧合，而是精心安排的。coincidence意思为“巧合的事情”，与well planned相对。occurrence偶然发生的事；arrangement安排；小事件；事变。