Sanya is a beautiful city. There are many people here vacation every year.A. inB. onC. for

问题补充：

Sanya is a beautiful city. There are many people here vacation every year.

A. in

B. on

C. for

D. to

答案：

A. in

(答案→)B. on

C. for

D. to

解析：in在里面；on在上面；for为了，对于；to到，向。句意：三亚是一个美丽的城市。每年都有很多人到这儿来旅游。短语on vacation度假。故选B。