— So how long have you been in Beijing? — Just a couple of days. I’m on a great tour you

问题补充：

— So how long have you been in Beijing?

— Just a couple of days. I’m on a great tour, you know, and I all the places of interest here.

A. visited

B. am visiting

C. have visited

D. have been visiting

答案：

A. visited

B. am visiting

(答案→)C. have visited

D. have been visiting

解析：考查时态。句意：因此你在北京呆了多久？——只有两天、你知道我正在进行一次伟大的旅行，我参观了所有有趣的地方。结合语境可知描述的是现在已经完成的动作，故用现在完成时态，选C。