They've won their last three matches, _____ I find a bit surprising. [ ]

A. that

B. when

C. what

D. which

引起慢性支气管炎患者静止时或活动时出现肺动脉高压的因素包括（）

A.肺小动脉炎症性狭窄、阻塞

B.左心室衰竭

C.肺泡缺氧

D.副交感神经张力增高

E.细支气管破坏，管壁增厚