— You speak very good English!

— Thanks. I ______ English in Shandong University for four years.

[      ]

A. study

B. studied

C. was studying

D. had studied

行政法的基本原则是什么（）。

A.依法行政原则

B.行政合法性与行政合理性原则

C.行政合法性原则

D.行政合理性原则

E.提高行政效率原则