【正确答案】 A

【答案解析】[解析] 约翰和玛丽合写一篇文章。collaborate合作，勾结。如：I hope I can collaborate with you on the project. 我希望在这个项目上和你合作。cooperate合作。如：She has agreed to cooperate with the police in the investigation. 她同意在调查中跟警察合作。compete竞争。如：Lots of candidates compete for the position. 许多候选者竞争这一职位。combine合并。如：Combine all seasonings well to make sauce. 把所有调味料调匀成酱汁待用。argue争论。如：I hear them argue about money．我听到他们为钱争吵。