_______ you have been to America for many times, you must know something about this country. [ ]

A. Since

B. Although

C. Unless

D. When

下列行为哪一项不会削弱内部审计师的客观性（）Ⅰ.建议新信息系统的应用程序的控制标准Ⅱ.为运行新的计算机应用程序编写程序初稿，确保建立了恰当的控制Ⅲ.在新的计算机应用程序安装之前，检查其程序

A.仅有Ⅰ

B.仅有Ⅱ

C.仅有Ⅲ

D.Ⅰ和Ⅲ