A:利用“设计试管婴儿”的脐带血
B:“设计试管婴儿”不一定非考虑他的性别
C:利用“设计试管婴儿”技术设计畸形胎儿,以供展览
D:利用“设计试管婴儿”提供骨髓造血干细胞,救治病人
He his homework last Sunday.
— Did you see Anna after class?
— I saw her leave the classroom, but I didn't notice __________after that.