Mr White ______ at 8:30 for the meeting, but he didn't show up.[ ]

A. should have arrived

B. should arrive

C. should be arriving

D. arrived

下列哪种情况是动脉导管依赖性心脏病（）

A.室间隔完整的肺动脉闭锁

B.矫正性大动脉转位

C.肺动脉闭锁合并室间隔缺损

D.完全性大动脉转位合并室间隔缺损

E.右室双出口合并动脉导管未闭