题目：
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：
答案：D
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。
