– What are you advertising ?---. I need a place to stay at.A. for; The houseB. to; A house

问题补充：

– What are you advertising ?

---. I need a place to stay at.

A. for; The house

B. to; A house

C. for; A flat

D. to; A room

答案：

A. for; The house

B. to; A house

(答案→)C. for; A flat

D. to; A room

解析：词义辨析。句意：你在为什么做广告？——结合下文，我需要一个住的地方。可知我需要的是一所公寓或房子。To表示做广告的对象，故选C为最佳答案。