患者，男性，脱疽日久，面容萎黄，消瘦，患肢肌肉萎缩，皮肤干燥脱屑，趾甲干燥肥厚，趾部坏死组织脱落后。创面生长缓慢，经久不愈，舌淡，脉沉细弱。其治法应为( )

A．温阳通脉散寒

B．活血通络止痛

C．温补肾阳

D．补气养血为主

E．以上都不是

He didn't make________clear when and where the meeting would be held.[ ]

A. this  

B. that

C. it  

D. these