单选题After living in America&n

问题补充：

单选题AfterlivinginAmericaforover20years,BrotherSwaysaidtoareportertheotherday,“I________donebiggerthings,hadbiggerachievementshadIstayedinChina.”.A.must doB.could doC.could have doneD.must have done

答案：

C