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

报检单位首次报检时须持本单位营业执照和政府批文办理登记备案手续，取得报检单位代码。其报检人员经检验检疫机构培训合格后领取《报检员证》，凭证报检。