The patients are quite to the nurses for their special care. A. kind B. helpful C. impolit

问题补充：

The patients are quite to the nurses for their special care.

A. kind

B. helpful

C. impolite

D. grateful

答案：

A. kind

B. helpful

C. impolite

(答案→)D. grateful

解析：根据句意病人对护士的专门的照顾应该很感激，grateful表示此意，故选D。