________ you call me to say you're not attending my birthday party, I'll see you at it.[ ]

A. Whether  

B. Though

C. Until  

D. Unless

氢氟酸烧伤（）。

A.烧伤后可引发白内障

B.创面疼痛剧烈，常侵蚀骨组织

C.创面自行愈合后往往遗留明显的瘢痕

D.伤后出现声嘶和喘鸣

E.伤后常出现神志障碍