幕上急性硬膜外血肿引起再次昏迷的主要原因是

A．脑水肿
B．脑血管痉挛
C．脑干挫裂伤
D．小脑幕切迹疝
E．枕大孔疝

It seemed to me that she was in doubt ________ Mahoney lived or died.[ ]

A．that  

B．how

C．why  

D．whether