[agroupof的谓语动词]a couple of 后面谓语动词

agroupofpeople是用复数asetofkeys要看强调的是“一串”还是“钥匙”吧，若强调前者用单数，强调后者用复数；agroupof后面只能接可数名词比如说Agroupofpeopleareonatour一群人在参观Wouldyouchaper