— How long ____ you ____ in the country with your grandparents, Henry?

— About four weeks. I'll return as soon as school starts. [ ]

A. are; staying

B. did; stay

C. do; stay

D. had; stayed

下列哪一项不属于手机病毒的危害（）

A、传达非法信息

B、未造成通讯系统瘫痪

C、破坏手机的软件

D、用户信息被窃