---Is mother a teacher? ---Yes, and Lucy and Lily are .
A. Lucy and Lily’s, twin sisters
B. Lucy and Lily’s, twin sister
C. Lucy’s and Lily’s, twin sisters
D. Lucy’s and Lily’s, twin sister
网友回答
(答案→)A. Lucy and Lily’s, twin sisters
B. Lucy and Lily’s, twin sister
C. Lucy’s and Lily’s, twin sisters
D. Lucy’s and Lily’s, twin sister
解析：在表示两个人共有某个东西时，’s要加在最后的那个人后面，Lucy and Lily 是复数，故选A