It was from only a few supplies that she had brought in the village ____ the hostess cooked such a nice

dinner. [ ]

A. where      

B. when        

C. that      

D. which

金某：男，40岁。 初诊日期：一九八四年五月九日。病者烦渴多饮，尿频量多，并有多食善饥，形体消瘦，就诊某医院。医者视其舌红，苔燥，两脉洪实有力，投予二冬汤治之，半月后收效。 病例分析要求： ①病者所患之证为何病何型？ ②以二冬汤治之收效，试述其理。