单选题A study has found th

问题补充：

单选题Astudyhasfoundthat80%ofthepeoplewho______tobeconstantlydistracted______more“workingmemory”.A.appears; haveB.appear; hasC.appears; hasD.appear; have

答案：

D解析考查主谓一致。定语从句的关系代词who指代先行词the people在句中做主语，谓语动词用复数；第二空是句子真正的谓语动词，主语是80% of the people，谓语动词用复数。