I failed again in the examination and only then_______how much time I had wasted.

A．I realized

B．I had realized

C．did I realize

D．had I realized

体外授精胚胎移植患者最常用的取卵方法是

A．开腹取卵

B．腹腔镜取卵

C．宫腔镜取卵

D． * * 超声引导下穿刺取卵

E．腹部超声引导下穿刺取卵