We _____ what gift we should send to our teacher when Todd came up with a good idea. [ ]

A. argued about

B. had argued about

C. were arguing about

D. would argue about

对一国的政治风险进行评估的方法有许多种，其中依赖于专家力量的评估方法是( )

A．实地考察法和专家咨询法

B．专家咨询法和数量分析法

C．数量分析法和德尔菲法

D．专家咨询法和德尔菲法