The reason why we were so late is________

A．because of the car’s breaking down

B．That the car breaking down

C．because the car broke down

D．that the car broke down

病人平卧下肢曲张静脉充盈时，在腹股沟下方扎橡皮带阻断大隐静脉，然后让病人站立，放开橡皮带，见曲张静脉由上而下迅速充盈。诊断考虑

A．下肢深静脉瓣膜功能不全
B．下肢深静脉阻塞
C．隐-股静脉瓣膜功能不全
D．交通静脉瓣膜功能不全
E．小隐静脉瓣膜功能不全