女，30岁，孕2产0。诉：13岁来月经，28～30天1次，每次6天，量中等，无痛经。但从第2次人流后出现痛经，而且逐渐加重，现在无法忍受，必须哌替啶方能缓解。妇检：子宫后位固定，直肠子宫陷凹触痛明显。病人最大可能是（）

A.原发性痛经

B.继发性痛经

C.子宫内膜异位症

D.子宫内膜炎

E.盆腔炎

Not until his father died ____ what his father really meant. [ ]

A. do they realize

B. did they realize

C. realized they

D. had they realized