- How long in Shanghai? For two weeks. I’m going to visit some schools in Shanghai

问题补充：

--- How long in Shanghai? --- For two weeks. I’m going to visit some schools in Shanghai.

A. did you stay

B. have you stayed

C. are you staying

D. do you stay

答案：

A. did you stay

B. have you stayed

(答案→)C. are you staying

D. do you stay

解析： 考察时态。本题使用现在进行时表示将来时，说明这是一个事先计划好的安排好的要发生的事情。句义：—你要在上海多久？—两个星期，我要到上海去参观一些学校。根据句义说明这样的安排是事先计划好的。故C正确。