The excellent student abroad for many years is on the way back to her own country.A. to

问题补充：

The excellent student, abroad for many years, is on the way back to her own country.

A. to study

B. studying

C. to have studied

D. having studied

答案：

A. to study

B. studying

C. to have studied

(答案→)D. having studied

解析：考查非谓语动词。The excellent student和study之间是主谓关系，且study这一动作发生在主句谓语动词is on the way back to her own country正确，所以要用doing的完成时。选D。