定义类:packageutils;publicclassRep{publicstaticStringtwice(Strings){returns+s;}}再定义另一个类Demo://insertcodeherepublicclassDemo{publicstaticvoidmain(String[]args){System.out.println(twice("Hello"));}}在第一行插入哪项代码,可以使程序正常编译和执行?()
A.importutils.*;
B.importutils.Rep.*;
C.importstaticutils.Rep.twice;
D.staticimportutils.Rep.twice;