I dropped and it wetted the carpet in the sitting roomA. a coffee cupB. a coffee’s cupC.

问题补充：

I dropped and it wetted the carpet in the sitting room．

A. a coffee cup

B. a coffee’s cup

C. a cup of coffee

D. a cup’s coffee

答案：

A. a coffee cup

B. a coffee’s cup

(答案→)C. a cup of coffee

D. a cup’s coffee

解析：考查短语：一杯咖啡a cup of coffee，句意：我把一杯咖啡掉到地上，卧室的地毯湿了。所以选C。