afewyearsagothebeliefbecamegeneralthatorangejuiceandmilkshouldneverbedrunkatthesamemeal
1.shouldneverbedrunk是一般过去的被动语态么?由情态动词should来体现be的时态?
2.bedrunk算是主要动词?
bedrunk是shouldneverbedrunk中的主要动词么~