来自韩向芹的问题
i_englishformanyyearsbeforeienteredtheuniversityAhavelearnedBhavebeenlearnedChadlearnedDhadbeenlearned
i_englishformanyyearsbeforeienteredtheuniversity
Ahavelearned
Bhavebeenlearned
Chadlearned
Dhadbeenlearned

