I would have attended your birthday party last night but for the fact that it ______ at that time. [ ]

A. would rain      

B. was raining  

C. had rained      

D. had been raining

关于偏头痛发病机制，下列叙述不正确的是（）

A.女性发作多与内分泌失调有关

B.可能有家族遗传因素影响

C.与体内5-羟色胺（5-HT）代谢异常有关

D.可能与颅内外血管功能调节障碍有关

E.可能与皮质锥体细胞功能障碍有关