问题详情

It can be inferred from Paragraph One that Boeing and Airbus______.

A．have not suffered from a reduction of new orders until this year

B．did not compete with each other intensely in the past

C．used to advertise their success in business at air shows

D．would have to resolve their rivalry as early as possible

请帮忙给出正确答案和分析，谢谢！