John was fired by his factory and only then ________ how wrong he was to be lazy and careless.[ ]

A. had he realized  

B. he had realized

C. did he realize  

D. he realized

子宫肌瘤合并妊娠时红色变性

A．腹部包块
B．月经量增多，周期缩短，经期延长
C．尿频、排尿障碍等压迫症状
D． * * 分泌物增多伴不规则 * * 出血
E．腹痛、发热