颅后窝占位病变可引起下列哪种（）

A.幕下疝

B.钩回疝

C.小脑扁桃体疝

D.海马回疝

E.扣带回疝

One day Chuck is ______ a flight ______ the Pacific Ocean suddenly ______ his plane crashes.[ ]

A. in; over; while  

B. on; across; when

C. with; through; then  

D. on; across; as