Our town________poor in the past,but great changes________in the town in the past three years. [ ]

A. was; had taken place  

B. was; have taken place

C. has been; had taken place  

D. has been; have taken place

导游人员，是指依照相关规定取得导游证，接受（）委派，为旅游者提供向导、讲解及相关旅游服务的人员。

A.工商行政管理局

B.旅行团

C.有关团体

D.旅行社