问题补充：
The student, in Jinshan Middle School for 3 years, was admitted into Qinghua University.
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：考查过去分词做状语，句意：在金山中学学习了3年后，这些学生被清华录取了。Having studied in Jinshan Middle School for 3 years相当于After they studied in Jinshan Middle School for 3 years，是个时间状语，因为是 在金山中学学习了3年，然后才被清华录取。用现在分词的完成式。选D。
