11个月婴儿，大哭后突然"上不来气"，伴青紫，约30秒后恢复呼吸，青紫随之缓解，严重时可有意识丧失，脑电图无异常，其可能的诊断是（）

A.儿童失神癫痫

B.晕厥

C.癔病

D.抽动症

E.屏气发作

— Jenny took the 8:00 bus to Guangzhou this morning.

— Really? He _____ the 9:00 train. It's much more comfortable and safer to travel by train. [ ]

A. could have taken

B. should take

C. must have taken

D. can take