下列不属枕骨大孔疝的常见症状的是（）

A.剧烈头痛、呕吐

B.颈项强直

C.早期出现一侧瞳孔散大

D.意识障碍

E.呼吸骤停发生早

Jenny was very sad over the loss of the photos she had shot at Canada, ____ this was a memory she

especially treasured.[ ]

A. as

B. if

C. when

D. where