A:受精卵和次级精母细胞
B:受精卵和初级精母细胞
C:初级精母细胞和雄猴的神经元
D:精子和猴的肠上皮细胞
下列说法正确的是( )
——I can hardly believe my eyes. Is that you, Lucy?——Yes. It has been almost 20 years______ we were together.